Get a good book and study up.. If you have been saving your brass, then it will certainly cut your cost, IF you have the time to dedicate to it..
Bullet heads and powder and primers are pretty much available, it's the brass that's been hard to get..
There are two basic types of presses - one at a time press and progressive presses..
With one at a time type, basically you would get your brass together and cleaned
de-prime one at a time until all the brass is done, then prime one at a time until done, etc...
With a progressive there are 4 stations, so you put in the 1st shell and the 1st step is done, then you add another shell (the 1st shell rotates to the next position) now shell you just added does the 1st step, and the shell you did 1st does the 2nd step ,then the next time 3rd step, 2nd step, and 1st step,
Next one 4th (completed bullet) 3rd, 2nd, 1st - from this point forward you get a one completed bullet with each lever pull..
The progressives are more expensive, but speeds up and simplifies the process..
That's all I know, like I said, get a good book and it will tell you about all the different powders and measures for each caliber bullet..
Well within most peoples ability to do, but you need to pay attention to what you are doing so you don't get a shell with too much powder (Big Bang, and may damage the gun) or little to no powder which can cause a squib load (bullet gets stuck in the barrel, and the next bullet makes the gun blow up)..
If you are NOT too ADHD - and can pay attention to details for long periods of time, and you are the kind of person that doesn't mind doing repetitive tasks, then go for it..