Hey Pam! No stupid questions here. We are here for eachother, and that is a very good thing. So lay it out there!
My thoughts are,
Depending when your surgery was done, your body will tell you with the discomfort you feel. Laying on the operated side to a long time for me, due to the incision and allergic reaction ... But I also have an amazing memory foam matress, which does not localize pressure as some spring matresses can do.
The most important thing, which was brought up, is to protect your operated hip from internally rotating, and thus, crossing the "mid-line" of the body too soon after surgery. You need not fear, ok, so rest your mind, soul, heart ...
You're going to be fine. Just do the pillow trick between the knees when you lie on your non-operated side as well as if your are able to lie on your operated side too.
I used the 4 inch sitting cushion in place of a pillow between my knees - its thickness was always consistent. I did have trouble sleeping at first - beginning on my back, then to my non-operated side, then back onto my back. Be as comfortable as you can. And do not worry k? You are doing great!
Best.