I use good quality thread when piecing. You don't want to use the hand quilting thread for that because it is thicker and doesn't allow the fabric to lay down as well at the seams. I use hand quilting thread when actually doing the quilting process, joining the 3 layers, only when quilting by hand, not in the machine. Really messes up the tension. It is possible to use other thread, good quality, but if I have to use it I run it thru beeswax first. It lessens tangling and helps to make it stronger. Good luck and welcome to the board. Everyone is so very helpful.
Wendy B