Mikey, it's really easy. All the math is done for you by Yahoo - all you have to do is decide who you want to have play each week. It takes about two minutes once a week, unless you want to make it take longer. Most of the time, you just leave the best players to start for your team. When the team one of your starters is playing for (in real life) has a bye week, you move one of your bench players onto the starting team. If one of your guys goes down because of injury, you either drop him (if it's a major injury, lost for the season) and pick up someone off the waiver wire or let him sit on the bench while he heals. If someone underperforms consistently, you can drop him and pick up someone off the waiver wire or offer a trade to one of the other teams.
All moves for the team have to be made before the games start - in fact, it may actually be the day before, I forget. But once the deadline is reached, the roster is set and you just wait and watch the scoring pages and cheer when your guys have a good day and groan when they don't. But in any case, it looks WAAAYY more complicated when you're reading the rules than it really is. I'm not what you would consider a fantasy geek - I normally play one team during baseball, one team during football, fantasy auto racing during NASCAR season and I do pro football Pick'em. The real geeks will play a bunch of teams in all the sports. But it helps keep the season interesting.
The worst that happens is that you don't like it, you quit playing and the rest of us compete for the league title. That happens in every public league I've ever played in. What do you have to lose?