Yeah, Simontons are pretty forgiving. I tackled a couple last summer, and even though my openings weren't perfect (old house problems...), they still went in without much headache. Just take your time and keep those shims close. You've got this.
Did a few Simontons myself about three years ago, and yeah, they're pretty forgiving. Had one opening that was way off-square (thanks, previous owner...) and even then, the window went in without too much fuss. Just spent extra time shimming and checking alignment. Honestly, the biggest headache was getting the old windows out without wrecking the siding. Sounds like you're already on the right track—just stay patient and it'll work out fine.
Did Simontons on my place last year, and honestly, I wouldn't call them a total breeze. Sure, they're forgiving enough, but if you're dealing with really wonky openings (like mine were), expect a bit more frustration than you might think. Shimming and alignment took me way longer than anticipated—maybe I'm just picky? But yeah, pulling out the old windows without trashing the siding was definitely the worst part...no argument there.
"Shimming and alignment took me way longer than anticipated—maybe I'm just picky?"
I get where you're coming from, but honestly, Simontons are pretty straightforward compared to some others I've dealt with. Alignment can be tricky regardless of brand if your openings are way off. A quick tip: next time, try using composite shims—they're easier to snap off cleanly and can save you some hassle. But yeah, pulling old windows without wrecking siding is always a headache...been there more times than I'd like to admit.
Composite shims are definitely the way to go—I switched to them after snapping off wood ones unevenly a few too many times. Simontons aren't bad, but honestly, if your rough openings aren't square, every window install turns into an afternoon puzzle...ask me how I know.