Right. You should get some lovely instructions with the Avids you ordered, and, being a bloke, you'll ignore them. However, they will probably prove to be invaluable to your upgrade project. My advice is this: wait 'til you get the bits, have a good go at following the instructions, make some mistakes, learn from them for next time and then post to let us know how you got on. It's really pretty simple. Hope you get on ok. Were there any particular stages of the process you were concerned about?