ok so i got me some diamond dust hole saw bits and im wanting to know what the best kind of drill to use is. im guessing a variable speed somethign you can control easily. but is it better to go with a coordless or a wired so you dont have to worry about the battery dien on your in the middle of it. i know not to apply a lot of pressure and to use water to keep cool. i have seen it done several times but i wanna do it myself now and i got a few people wanting me to drill there tanks. but im gonna do my own first just want a little advice first before i shatter a couple tanks lol.