Looks a good 'un Mate
Going through same process with my S2, and the doubts do come & go.
BUT...................... the fact that it gets a bit scary from time to time, makes the sense of achievement you get when you get something spot on amazing, even if it just something small, it's like one more battle won
As previously mentioned, take heaps of pics, label everything up as you g, also little tip, next time your in the bank ask for some money bags, there free and great for storing fixings/nuts/bolts etc, just stick bits in the bags in groups with a bit of paper describing 'em fold the top over, jobs a good 'un