Last weekend, I spent four hours in my LQS selecting fabrics for a quilt. Yesterday, spent two hours for another project.
Unless you have a really clear idea of what you want, taking the time will let you add/delete/modify your choices. Just my opinion...
But as the owner of the LQS said, your fabric choices evolve the more you study them. Then :lol: she pointed out that I might end up changing my mind as the quilt comes together.