heck, even ben's b!tches plays in Eb

get a chromatic tuner

or if you dont have one, here's an old trick i used when i just started playing guitar, tuning my sisters classical to Drop C without a chromatic tuner

start in standard E tuning. since Eb tuning is a half step down, means its is 1 fret lower in terms of pitch. so what you do is, fret the first fret of every string with your left hand, and tune them back to standard. that way, you'll down tune ½ step. much easier done with a capo. else do it string by string

this way might sound stupid, but this is how i started off

my preferred tuning is D standard or drop C. can't stand high tunings