eibach springs are shorter than stock, so you won't need a compressor, however becareful pulling the stock springs off. They are under alot of compression.
You'll need a 4 wheel alignment afterwards to compensate for the extra negative camber you will have front and rear, and also toe.
Also, make sure to use jack stands and wheel chocks. Never use a floor or scissor jack to keep the car in the air.
A couple of tips. With the eibachs, the front is considerably lower than the rear. You can slide some dual ply vacuum tubing around the front dead coils (I did that to raise the front a bit), and it will also keep the springs from clanking.