I just did some re-piping as well. First I would say the goal is to fully seat connections. Also, be sure to use the ratchet cutter properly, as even that makes a difference on the cuts. I say that because I made the mistake of not paying attention to that. So I try have everything measured, pre cut, cleaned and ready to go. Without any glue- loosely dry fit to give yourself a final visual of what the connection will look like, and what is the best way to assemble it. Try to give yourself as much room to work as possible, if you can assemble one end of connection away from its final connection point (sometimes could be the inverse of this)- do that first usually a coupling or 90. But, be sure you dry fit it first. I say loosely bcz aren’t easy to pull apart dry. So, deep breath, slow down, one end at a time. Prime (usually the purple)both the fixed, and new, then swirl the blue glue, don’t need to get crazy with it . A nice even coat, maybe three swirls up, then as u push in u want to be turning your pipe/connecrtion to the fixed end slowly as u push in (turn to right or left, threse aren’t threaded- but I just stick w righty tighty). I think straight cuts , clean off both ends of connection. Prime . Conserve glue. Forgive yourself. There’s plenty more PVC pipe out there. Hope this helps.