You need to drill out the old rivets holding the mechanisms in, and you need a rivet gun to re-rivet the new mechs in:up:
So no, you cant do it without. Some people use small nuts and bolts to put them in, but that is bad practise IMO as they will work loose.
still took me a blown up 4 way switch and loads of swearing to get it all donepiece of cake....
3 wires are for central locking... they just splice into the existing loom
then theres a live. ground. window up. window down. window live. total closure. and child lock wire. thats only 8 wires you need to connect