Why don't you dive in and do it yourself?
M88s are a different beast to glass bed. Because of the way they are held together, they need some special attention. That makes them trickier than bolt actions and other similar rifles.
I won't do your rifle for you but if you decide to do it yourself you need to make sure you have all of the support areas covered both in front of the receiver/back of the receiver as well as from the receiver to just past the barrel hold down screw. The most important part is just in front of the mag well/ramp up to the barrel screw. If that area isn't tightly bedded, there will be pressure against the barrel and receiver which will cause accuracy inconsistency. Not many gunsmiths know how to do those fine old girls properly. Be careful they describe what they are going to do before hand.