I have a low budget studio too man. First do what they said, let the player tweak his gear until hes happy with it. Then do a recording test. If it has too much low end or high end that not even the mixer EQ can fix then go back to the gear and fix it. Experiment with mic placement and also record at a volume where the amp sounds good. If the amp gets muddy at a low volume then crank it up. Its a very tedious and frustrating First step but very important. Also remember to always leave space for each instrument, so if your happy with a really deep thick guitar tone keep in mind that your bass and drums still have lows to squash in there. And the double tracking is so you dont have to use so much gain and low end on your guitars. Make the guitarist play rythm twice and pan one to the left and one to the right. This will thicken your sound and make it more stereophonic. Recording will take aout 4 days in my opinion. Getting the right sound for the actual instrument is one day. Recording drums and rythm the next, maybe some rough vocals. Third day is leads,vocals and maybe extra stuff. Fourth day is the mixing and editing...But all that I said is from what I'M learning.