Some T&Rs are really easy, but not at all examinable, such as Hoodwink.
Others, such as Reformation and Reparation, are knock-out effects, but are quite difficult to perform. Furthermore, they're relatively expensive on resources.
For a really nice T&R that restores 3/4 of the card and is totally examinable, I like J C Wagner's T & R. You'll find it in his book Seven Secrets. And while it takes some practice, I should think that it's within anybody's range.
[ September 04, 2001: Message edited by: Dave Le Fevre ]