Yup!  I trained Meep to a harness and leash at a very young age.  

You have to get her to trust you first, before you try to put a
harness on her, or you risk destroying whatever small trust she has in
you so far.

You need to do this right, or she'll never accept the harness.

Once she lets you pick her up, get a figure-8 cat harness and put it
on her.  Cats can get out of H-shaped harnesses fairly easily.  Let
her freak, then take it off once she calms down.  Put it on her every
day until she consistently accepts/ignores it.  Never take it off
until she's calm, unless she's in trouble.

Next, find a short length of 1/4" or so cotton rope - maybe two or
three feet, needs to be long enough to drag on the floor, short enough
not to catch on things.  Tie it to the harness, and again, do this
each day until the rope dragging behind doesn't bother her.  

Goes without saying that you are supervising her at all times during
these steps.

The next step is to attach a leash.  At this point, you're still in
the house.   Keep hold of it, but let her go where she pleases and try
not to put any pressure on it yet.  Follow her around.  Once she gets
used to that, gradually introduce some pressure, and try to gently
convince her to go the way you want to go.  Once she accepts this -
passive resistance is OK, Meep still does that, what you want is for
her not to freak out and do the 'fish out of water' act - take her out
on the leash in the back yard.  

When you both have that down pat, try a short walk in your local
neighborhood.  I can't take this step, 'cause Meep's terrified of
strangers.  She'll only work on a leash if there isn't a soul around
'cept my husband and myself.

jmc
usenet [at] jodi [dit] ws
Any day you learn something isn't a total waste.