Make your question more specific. It's hard to answer without enough info. Give also some examples to make the idea clearer.
Yes, more details would be helpful. But here's a couple thoughts. If your how to guide has a specific number of tips, for example, "10 ways to sell your car fast", rather than looking for a domain with "how to" in it (which it sounds like you are doing, if I am understanding your post correctly), try "10tips..." or "10ways..." (or "TenTips..." or "TenWays..."). Does that make sense? Coming up with a great domain is not always easy but if you think outside the box a bit you might come up with a really great one!