hokie1525: Which 4?
Look at the yardage gaps and space them as even as you can and learn the other shots with them-punch, pitch, chip and flop.
By way of an example, my wedges are 60 80 100 and the set wedge is 120. Nice even numbers that you split up with punches. 50 60 68 80 84 100 103 120. For me, 90 yards is the weak point but the 100W is very accurate in that range and the 84 yard punch rolls with spin to as much as 96.
The 4 wedges I carried back when were the 64, 60, 56 and 52 degree wedges. They were oilcan Satins and they're no longer available. If I were to put myself back then with today's equipment, I would have all 4 CG wedges available at level 27.