IMHO.
Ignorant=lack of education.
Dumb=inability to learn (for whatever reason).
Stupid=you know better, But do it anyway.
Chris in your spare time, read the whole, Lee book. Some of it applies, now some later.
Frankfort Arsenal has a nice little digital scale. The Lee scale is a PITA. But, very accurate. IE. it moves when you breath on it.
Can't get to Midwayusa. Or I would send you a link.
Tumbler. You get what you pay for. Make sure, there is a fan underneath for the motor. Heard some don't have a fan.
On your bolt reloads, you could get away with 0000 (4/0) steel wool.
I use corn cob, a hand full of walnut (for range pick ups), and Nu-finish.
Have fun. Be safe.