I put an above ground in with a deck, I planned that for nearly one year.
If your planning to put in an inground pool in 4-6 weeks and you haven't even firmed up a budget, or picked a type of pool or gotten a short list of contractors by this time I think your rushing it. Your planning a major construction job and as such you should spend the proper time planning, just my 2 cents but I'd spend the winter planning it thoroughly so you can execute early next year, otherwise your putting all your faith in the contractor.