I sure this goes without saying, you can always cut more off, but you cannot add it back on.
on the complex plumbing I did under my tank to both utilize existing fittings and hit a specific part of the floor, I cut and fit each part as I went. I dry fit most of it but left extra room knowing that the solvent would allow a closer fit than dry. I did have one issue when it came to the returns, my cross pipes were too short after glue and I had to cut and splice to make it fit. it sucked, but ended up working. but for the most part, I cut and glued each piece then moved on. the tank mains are 2" and the CL is 1.5"
