Just take your time, and the adage from carpentry is good here too: measure twice, fit once.
For example, one gotcha -- the only one I'm aware of that I did: you will note during the installation that the computer takes a number of inputs, all of which involve individual connections to various places in the wiring diagram. The cruise control MUST disengage when the brakes are tapped, so there is a connection to both the rear (foot) brake switch and the front brake switch. Likewise, there will be a connection for the clutch switch The McCruise design philosophy is to minimize the number of wiring splices, and instead prefers to connect where a wire already connects, and add a connection there.
This is the case with the front brake switch, and my mistake, was in reinstalling that connection (basically, remove the hot wire from the brake light switch, add the McCruise-supplied connection, then reconnect), I did not adequately reattach the connector to the brake light switch, and somewhere on my trip, it fell off. Only during a group ride, after a stop, did several other riders say, "Man, I don't believe you were going down all those steep mountain roads without using your brakes. I'm pretty sure your brake lights are out." About five guys were peering at the bike (a real crowd pleaser in a sea of Honda ST1300s) and after a few minutes, one guy said, "What's this wire hanging off here ?" BINGO. Pushed it back on on the spot, and all has been fine since.
So, just take your time -- I'm no expert, I just find it fun -- and enjoy.