Transmission is slipping...

I've never really been the fix it type and now I am beginning to feel stupid. The transmission is slipping on my full size truck and I'm not sure what to do about it. It's starting to make thing hard for me on the farm. I seem to be able to barely get around, but when it somes to pulling heavy loads and applying the real horsepower under the hood, well things are just slipping. I'm tried adding more fluid and that doesn't seem to be helping. I've even missed some of the kids soccor games because I had to cruise real slow on the highway which made me late and all but ruined my filming of the family video's. My ytuck has broght me this far and by no means am I ready to scrap it or give it up... I'll get my hands dirty and jump right in the middle of it if I have to. I know that for people who work on transmissions for a living and have the special tranining necessary can do this kind of stuff with thier eyes closed. I've purchased the little book on the transmission from the hardware store and after I got through the basics, it's all turning into Greek right before my eyes. There is just so much out there and without any real direct help things are really slowing down... really, really slowing down. I don't feel like I am learning anything, in fact things I was learning are getting messy in my head. Right now I couldn't even show you where the dip-stick is... sometimes lately I think he's sitting behind the wheel. I'd rather not turn the job over to someone else... what I really want in some help in making this happen. I wish the local college offered a class in this type of thing becasue I know I could really tear it up then. There is no way that transmission specialists all learn by themselves. It's challenging and I've come a long way from nothing but my wheels are spinning literally and I want to make it somewhere someday and not be stuck in the same driveway... the engine running and going nowhere.