I have a launch Wii (NTSC-U / D2A) as well, and decided to mod it myself last summer with zero soldering experience. (Wiikey)
I can say it's possible as long as you do your homework / get all of the proper tools / take your time, as I haven't had any problems with the installation to date. (although that could have just been beginner's luck
)
I personally used the wire installation instead of the quick solder.
As far as which chip is the best... I'm not sure these days, but I've heard good things about Yaosm, Cyclo, and from the looks of it Wiikey as well (since the support hasn't actually died, contrary to the rumors.)