I love me a blog tour! I've done quite a few now (as an author) and I definitely could write a manifesto...oh wait, appears I'm going to write one now. Sorry this is so long - I just see authors do so many things during these tours to shoot themselves in the foot. I hope these tips are helpful.
#1 tip: if a blog fails to post on time DO NOT CONTACT THEM AND DEMAND TO KNOW WHY THE POST ISN'T UP.
No, seriously, do not do that. Bloggers are amateurs/hobbyists/unpaid etc. They do this because they WANT to, not because they HAVE to, and they don't work for you (and by you I mean - authors). Tech hiccups happen. People might forget or mix up the date. They might have a personal emergency. They might be in a different time zone (as much as a day behind you) and their post will go up later in the day. Etc. Sometimes they flake. It happens.
I do guest interviews for spec authors on my blog. If a post is late and the author emails me asking where their post is, they NEVER get asked back to my blog. I just had one author post a snarky comment on my blog b/c I made a typo on her name. Never being invited back (if it bugged her that much she should have politely emailed me and pointed out the mistake). I'm doing the authors a favor, giving them some free promo, allowing them to tap into my blog readers and taking time away from promoting myself and/or writing to do this for them - they damn sure better not act like I work for them. Grrrr...where are my angry eyes?
On the other hand, you are paying the tour operator, they DO work for you and you have a right to express displeasure (to the tour operator, not the bloggers) if you pay for 10 appearances and only get 8 b/c two blogs never posted.
Do stop by each of the blogs on the day of your appearance and leave a comment. Check back frequently and respond to comments that are left - try to build some interaction. However, do NOT EVER respond negatively to a negative comment. There is no rule that says everyone on the planet has to love you or your book or your book's premise or your book's cover, etc. So don't expect all love and kisses; there might be some people who say things you don't like (that they hate your cover, that your book premise is just like another book they read, etc.). Don't respond. Remember that the blog is the BLOGGER'S forum to interact with his/her audience, not yours. You have no control over what happens there. You are just stopping by to the talk to the Blogger's audience/readers. NEVER contact a blogger and demand that they remove a comment you don't like, sanction a commenter for something you don't like, etc. Not.Your.Blog.
It's very likely you'll hear crickets chirping during your visit. That's not a bad thing/sign of blog tour failure. It's REALLY hard to get people to comment on blog posts. If you run your own blog, you know this for a fact. So people saw the post, saw your book cover, made note of it, and moved on. Mission accomplished. Your tour did its job. So don't let lack of comments get you down.
You may or may not see a spike in sales. People rarely run right out and buy a book the second they hear about it. It's unrealistic to expect your book to create such a frenzy. It's much more likely that you'll see a spike in people shelving it on goodreads. You might see a bump in twitter followers and/or FB likes. Those are good, too. Remember - long term, slow and steady is the name of the game in book marketing. Many small steps like this add up over time.
On average, people have to hear mention of something seven times before they act on the information. If you're doing a ten-blog stop, some of the readers might be cross readers so they might see your book mentioned 2 or 3 times in a day or a week. Also, most book bloggers post at least once per day, sometimes more offten than that, so you are the top story for a VERY short period of time, which also limits the exposure. For this reason I've found that one day promo blitzes have almost no effect. It's too short of an exposure. I never do less than 2 weeks anymore and doing two stops per day (a promo spot and a guest post or interview, etc.) during the two weeks is the best. Interviews seem to have the least effect - readers don't much care to read an interview with an author they don't know. Promos and guest posts seem to be the most effective (in my experience).
The only people who are going to jump around the internet and go to each stop/follow the tour are your fans, unless there is an incentive (giveaways). The blog's readers probably won't. They'll read the post on the blog they follow and that's it, so the traffic at each site will be very variable.
A little gratitude goes a long way (b/c, sad to say, so many authors apparently never think to do these things): Thank the bloggers for participating (send them each a nice, personalized email). Follow the bloggers on twitter and/or friend them on FB (i.e. support them as they are supporting you, plus it's networking). Promote the hell out of the tour to your followers/fans (tweet daily, FB posts, etc.).
And lastly, I've used Bewitching several times and have liked them very much. Roxanne is great; you haven't been swindled and will have a good tour :-)
Good luck - the new 21st century author blessing: may your blog tour go smoothly and may your book prosper because of it