Just jiggle, bait a shot and peek.
Or you can prefire them if u here a scope sound
You can peek super shallow angles because a lot of awpers like to have their crosshair an inch or two next to the wall and if you're fast enough you can just fuck them.
If you want, you can demo review to see where they play and just preaim that spot
You can play of prefire/preaim maps and you get a good understanding of where a lot of common awping spots are so all you have to do is click when you peek.
Also you need to understand what kind of angles are good to peek. Look up "right eye peek" on google.