I've had my ATA armor for 5 years now and still going strong, one of the thickest armor out there and needed a dremel to trim it, scissors just would cut it. I don't think you will have any troubles with it.
Also have a look with coverstrips attached, I had to go a little bigger on the forearms because I wanted accurate coverstrip sizing so I just added some foam on the inside of the forearms so they don't wobble about
I find compression top and pants work well, you don't get bunching around elbows and knees, also keeps you cool as well as the two piece allows easy access for toilet breaks in armor
Can't go past a dremel (or their cheaper cousins ) I use a cutting disc and drum sander, just finish with a light sand of 400 grit sandpaper to smooth any sharp edges.