On a scale 1-10 how hard is fx's o-ring replacement

I just ordered a o-ring kit from AOA for my regulated Fx bobcat mk1. Does anybody have input on do's or don't before I get started. This is my first time taking the gun apart. With the kit I also had AOA add in silicone grease per there recommendation to lube the rings on install. 

If I use a micrometer to measure the regulator length before disassembly and noting length. On reassembly can I set the length the same and have equal regulated pressure as before?

Is there a adjustment for the hammer bounce spring?

Will I need to locate/note it's setting before disassembly?

I was expecting to measure the depth of the hammer bounce Allen headed nut in reference to the housing, or maybe there is a better way? I often over think these kind of things.

Thank You
 
Is your gun leaking? Is it not shooting properly? If it isn't leaking I wouldn't mess with it. Yes it is very easy. Hammer bounce? Do you mean hammer spring tension? Just put it together and chrono it. If it isn't broke why take it apart. I have a Bobcat Mk1 with 25k plus rounds through it and have only replaced breach oring. And I actually took out the old one and put it back in just to see the condition.only oring that really moves and wears is on the valve stem..put the kit in your bag and if something leaks fix it. Just my 2cents.