It's not something that I've done, but I've read logs of it, and I have friends who have done it.
There are basically two ways of doing it. One is to embed commands in otherwise ordinary conversation. You can see that done in the top log here:
http://wikihyp.com/tag/text/The other way is to build rapport, test to see when you can start leading the subject, and then lead the subject into trance with direct suggestions. It's a much more powerful method, because you can do more than a simple sentence command, but it's also more difficult and takes more practice.