I just did the most extensive mod on my bike yet, rejet, I know, big deal, lol. I was a mechanic in many fields (weedeaters to D8 dozers) for many years. The most important things I kept in my toolbox for extensive work was... cheap ziplock baggies & a magic marker. As you pull nuts & bolts out put them in the baggies & write desciptions on them. It seems silly, but will save hours & frustration. Also, If you put them in a box as you pull them, then you know the order to put things back.