see the FAQ and read the info on Stealthing. I think you are attempting to stealth too early. you haven't reached 80 in hiding yet.
if you can afford it or save enough for it, buy a small boat, get on the server line, make a UO assist macro that says forward one,, hide, pause, forward one, hide, pause. make a long macro so you won't have to press that macro key constantly. Doing that helped me get to 80 hiding fast.
THEN start on stealthing. GL.