<font face="Comic Sans MS">How long have you got?-to write down all the tips and wrinkles would take for ever. You need to get hold of a copy of `How to restore TR7&8` by Roger Williams, you need plenty of room and a solid table covered with an old carpet or similar to work on, a digital camera to take pics. as you strip out the first one (cut you finger nails or you will pay with pain) and take your time.
The base is straight forward , the back more complex as you have to unglue the bottom rear flap and release all the clips you can find, esp. the round ones and then look about a third way up to find and release the clips that hold the linen straps to the seam line that defines the outside shape. Then push your hands up the sides to release any stray glue that has stuck the covers to the foam-a few tugs and it should come off in one piece. You now have to decide if the foams and rubber straps etc. need to be renewed-esp. the base diaphragm!
If you are not good with craft skills then it will be a trial but, very rewarding-allow a week, but first you have to get the seats out. Start with the pass. as then the car is still drivable!
Hope this helps your decision! </font id="Comic Sans MS">
Enjoy& regards