I understand the excitement. I did my first partial mash last year, and I remember I was really intimidated. I've done about 4 or 5 since then, and honestly, there's really no reason to think too hard about it. If your mash water is in the right temp range, you let the grains mash long enough, you sparge at the right temp and collect as much of that converted sugar as you can so your gravity ends up within a few points of your aim, the rest is details. You can get very, very technical when mashing and lautering, but I leave that to the pros and the more serious brewers. This is still a hobby for me, and I want it to be fun. I don't want to have to break out calculators, charts, graphs, and lots of excess equipment on brew day. Chances are, the beer is going to turn out just fine, even if you **** up a little.
As always, RDWHAHB.