The installation is easy. Most are under the leading edge of the stab. Most planes have enough wood in this area to mount the servos. Driving them is the biggest problem guys run into. If your radio won't drive the two servos you will need a reverse "Y" harness. Things to watch for....Lay the servos on the bottom of the fuse and make sure they don't hit on the bottom. If they do ,you can stagger them or shim them out with a little ply. You need a little ply for the screws to go into anyway. If you have the room the ply can go inside the fuse. If not use it as a spacer. Make sure you have some wood around the mount area. These servos need to be surrounded on 4 sides. Another problem could be in the CG of the plane. If the plane is designed for a forward mounted servo, you can adversely effect the CG. To get around this, you can use micro servos, and/or slide the engine out on the mounts as far as possible. It is also possible to mount two micro servos in the stock location and run a sepperate push rod for each one to the tail. This is actually easier if you have the room in the fuse. Plus a stock "Y" harness will drive both servos.
I would post you a few pics of both ways but I am at work. I can add them this evening if you want. Let me know.

David