I taught myself how to reload in June 2007.
A friend and I learned together, and he loads a lot of rifle rounds on a single stage and I load a lot of pistol rounds on a turret press.
Together we've probably put together a few thousand rounds. He claims his .223's are just as accurate as factory, but he builds 500 rounds for about $30. I load .45acp and 9mm. Neither of us have any books on the subject (except for the ABC's of reloading, which is pure garbage history information, not good for someone interested in reloading for the first time. It's sitting on a shelf, it's yours if you want to pay shipping.) It does, however tell you how to measure chamber pressures, which is great....if you have the equipment.
Anyhow, reloading is only as exact a science as you want it to be. I weigh my charges on occasion and as long as they're within .2 grains (.1 grains on 9mm), I'm happy. I really just want to shoot for cheap, so I always load to the "minimum" or just under the minimum listed charge weight.
Once you get going, order your supplies from
www.powdervalleyinc.com they are the cheapest, and I use them for everything.... well, except
www.brassmanbrass.com has a special of $29 for 1000 9mm 125 grain LRN right now.
Get a lee press... and there are videos on how to set them up on lee's website... google "lee precision".
I started out weighing every single charge, now I weigh every 500th or so.