Any Advice??

We found one we like and we're trying to do our homework so that we know how much to offer. This is so nerve racking! Plus, I feel a little bad because the house we are interested in the most, the seller just started renting to a little family from Kansas, they have three kids and just moved in last weekend. From talking to them they weren't expecting anyone to be interested in buying the house for a while still, but we really like it and there are just enough improvements to be made that we feel confident we can deal with them. Don't want to jinx anything yet, just wish us luck and pray for us that we get the house!