>>106992170
whatever you do, don't round your back when doing the lift. Watch a lot of youtube videos. There's a few ways to do it. I kind of like to hold the bar tight and almost sit into my stance and then lift up.
Hopefully you can at least do 135, cause the height that the 45 lbs give the bar makes it more reasonable to do. Smaller weights actually make getting form correct even more difficult (unless you use those uhhhh crossfit weights? the ones meant to be bounced and shit but have the same diameter as a normal 45 lb)