How can i tune my 6th E down a half step without a tuner? I know that I could find out myself, but I'm too lazy to count the frets and the numbers confuse me. Please help!

Also tell me how to tune it back up. Thanks!

Tune down until the 6th fret 6th string sounds like the open 5th string, to go back up the 5th fret (6th string) should sound like the open 5th string. Thats how I'd do it anyway.