Don't worry about it so much. We managed to do it the very first time without messing up anything using only the text directions. It takes, literally, one or two minutes to do after the first time. Here's my brief layman's directions, for what they're worth:
1) Move the white clutch ring towards the input/motor end of the transmission.
2) Twist the black midsection parts of the transmission counter-clockwise. It shouldn't take much pressure to disengage it, but do so
slowly. There are several free-floating parts in the transmission that will fall out if you let them.
3) The pins are one of those parts. They are two very small metal cylinders. You can't miss them, they're the only small metal cylinders in the transmission.
If they don't fall out when you separate the transmission halves pick them out yourself.
4) Make sure that the metal ring with the three metal protrusions is sitting in the forward half of the transmission when you try and reassmble it; this makes things much easier than sitting it on the rear section.
5) Now, carefully examine the inner edges of the teal forward part of the transmission and the outer edges of the black rear part. The connections between the two should be fairly obvious.
6) Now this part is a bit tricky: you have to slide the two halves together while turning the output shaft of the forwad half until both the outer plastic couplings and the inner metal parts mesh correctly. It helps to have a second person turning the output shaft.
7) Once everything slides back together, simply twist clockwise until it locks into place.