I also want to add some support for fully insulated connectors, instead of the ones linked to in this thread. Yes, for pushbuttons it's not that critical, but it's one of those "good idea" things that prevent problems if a wire should vibrate off of a switch terminal. Depending on where it lands, it could save the cost of an interface board, or something even more valuable. Any wires carrying any real amount of power should absolutely use fully insulated crimp terminals. Any pushbuttons with lighting should use fully insulated terminals for all connections, as the risk of damaging something, or even causing a fire, is much greater.
As for the crimpers, if this is likely to be the only thing you ever do, then do what you can to get by and be happy with your sore hand. The sense of accomplishment will dull the pain

. But if you are the "handyman" type who collects tools to amass a "fixit arsenal" so as to face, head-on, any future repair challenges life may throw your way, don't be afraid to invest $30 on a cheap set of ratcheting crimpers. You'll be surprised at how handy they can be to have around and how much better your hand will feel after using them compared to the cheaper options. I used mine this weekend to get my RV running that had been "dead" for over two years (stupid corroded electric fuel pump connection...grrrr)
RandyT