As above, try not to wear too many layers as you will get hot, as well as them directing moisture into your mask.
Ramping is an assisted firing mode that "ramps" your marker's rate of fire up to a set cap when you pull the trigger at a certain speed. PSP and Millenium (they're large well-known paintball leagues) ramping modes are the most common.
PSP ramping: 4.5 pulls per second activation speed with a 1 second reactivation period (ie, you pull the trigger 5 times in one second and your marker fires at whatever max rof cap you have set, in this case 12bps, and if you wait less than a second between trigger pulls after achieving ramping, it will ramp anyway)
Millennium: 6 pps -> 12bps. if you fall below 6 pulls per second it won't ramp (ie it will shoot semi)