To range your wedges, go to your local high school football field off hours (early AM, later evening) and hit your wedges there. The distances are done for you. Golf shops sell bags of imperfect and recycled balls, which are close enuf to what you play with to give you a good estimate of distance. At least 10 swings with each club, throw out the two highest and lowest, and average what's left.
Another option is to get a bunch of white hand towels/rags and find an open field. Lay them out in 5-10 yard increments starting at about 25 yards.
If you have kids who play baseball and you can get the ball in the air (and they are nimble enuf to duck out of the way of your thins
), take your child along and have them shag your wedges, then call back the distances where they catch them.
For the longer clubs, find a range with decent range balls and get a laser rangefinder, as suggested above.
And if you see a thin, dark-haired stranger with a bulge in his trousers eyeing you as you raise the rangefinder to your brow, run like hell. The junk is coming out and that zipper has WD-40 on it.