Your credit will be checked a number of times during the home buying process. If you're concerned about 'too many credit checks ruining your credit', don't be. Typically you have 30 days of credit checks for the same thing without penalty to your score.. For example, say you want to get a car and are looking around to get the best deal, each place you go to will pull your credit, but because the inquiries are for the same thing, an auto loan and in a few week time span, no penalties. Basically it's put like this - you get one inquiry with penalty (all be it very small, like a couple points - if that) and the rest are freebies. Reason being, credit agencies know people are going to shop around, if they deducted points from everyone every time they went for a car loan or home etc, we'd all have horrific scores.
Keep in mind though, you can only 'shop around' penalty free for one item, home loan, or car loan, or personal loan, etc, if you combine any of those they will be treated as separate inquiries.
Good luck