Toyota Repair: 99 toyota rav4

Question
how difficult is replacing egr valve for a novice

Answer

egr valve   Not too difficult, you'll need a 12 mm socket and extension and a 3/8" ratchet to remove the two nuts that connect it to the intake chamber and a wrench (adjustable wrench may work) to remove the large nut at the bottom that connects the valve to the pipe (do this first)picture attached.