I'm tired already

I'm not published so I couldn't tell you a fail-safe method.
At some point you would probably have to go on a book signing tour. While on the tour, put as many posters and noise as possible. Make a blog, which is a pretty good substitute for a website. You have to reach as many people as possible. Act liek a chain e-mail (without being really annoying) tell all your friends and family to contact all their friends and family and on and on and on.

Also you can ask your publisher and/or agent as well.

Book signings don't often sell many books, especially if the author is relatively unknown.

I think the OP's book is in a very well-defined niche: in which case it shouldn't be too hard to work out how to find people who might be interested in that niche. Then, find publications which specialise in that niche and send out press releases, or offer to write articles about your experience; do the same with websites which have forums, or memberships, which fit your niche audience. Think creatively about who might be interested in your book, and how you can reach them. It is time-consuming and can be difficult, but it can be done.

If you don't have the time/energy to put into a full-on website right now, then sign up with Facebook and make a Facebook Fan Page for your book. That way you'll at least have a web address you can link people to. Facebook now allows you to create your own web link, so it will be something like facebook.com/BookTitle. You could even use this link on promo materials.

Hook up with Twitter, and learn how to reach people using hash tags.

You can link both services through Hootesuite, which is a program that allows you to schedule Twitter messages and Facebook posts up to months in advance. You won't always have to be logged on and "live" to post everything. It'll help you stay organized.

FWIW, but I promise you promoting your book is tiring, LOL! I have several books out with a small, e publisher and much of the marketing of the book was on my shoulders. I spent hours and hours self-promoting and marketing, and if it helps you, then that's a big plus! Here are the things I KNOW help an author with self-promotion:

-Get a website. It doesn't have to be fancy, but it DOES have to be clean, free from typos and crazy code. You can get website at a cost of pennies a day and you can buy domains cheap too. Host your domain somewhere like GoDaddy where it's super cheap and their website templates are generally very user friendly (meaning that one doesn't need to be a webdesigner or computer programmer to set up a nice website).

-If you don't have the $ for a website, definitely do Facebook. It's free to join, easy to use, and will make you, the author, easily accessible. Even if you have a website, I'd suggest Facebook as well.

-Now that you have a 'spot' on the web, look into joining readers/writers message boards. Places where you can connect with people who enjoy the kind of story you've written but MORE SO for you to join a community of people YOU have things in common with so you'll be highly likely to interact with the group regardless of your promoting agenda. To put it bluntly, don't join just to pimp yourself. It irks people and puts a bad taste in their mouths for you and your work.

-You can certainly do things like taking out ads and the like, just keep in mind those can be extremely costly and you should do your due diligence at making certain any advertisement you pay for is going to find the right audience.

I built up a loyal readership without spending anything but my time. I had a free website, I had a personal message board, and I spent hours on readers/publishers message boards getting to know people and letting them get to know me. And just starting out as I was, that was the best way to get 'known' and it worked beautifully. Once I established myself, it was much easier to pull back from daily interaction. After that, one really must keep websites up to date, and should at least step in to message boards to keep the brand alive, but the marketing becomes much less consuming. YMMV.

This was great stuff. Thanks for the valuable info!

It's valuable to me too, cause I will be in the same boat soon. The publisher has asked me to help promote my book so it goes both ways. Thanks for the advice.