impact hammer technique tips?

[Tvak@AOL.COM]

I bought an impact hammer from APSCO and it arrived today.  So I took it for 
a spin on a Cable console.  Did a pitch raise first, and of course, found it 
difficult to get the strings to go exactly where I wanted them, but then on 
the second pass I kinda got the hang of it and I'd have to say I liked it, 
and would like to get to know this thingee better.  For the most part, I 
found the pins to stay right where I put 'em and I liked that.  I did have 
several that slipped big time, though, so I know I don't really have the hang 
of it yet.  

Are there any source books available on impact hammer technique?  My initial 
questions are pretty basic, though; perhaps someone here on the list could 
give me some clues, as I am clueless.  So let me ask:   When I pop the pin 
into place and it's in tune, should I leave it there, or should I attempt to 
pop it slightly sharp and back it down into tune, like with a conventional 
hammer?  Is two o'clock a good position for the hammer?  (Seemed comfortable 
and workable for me, although in the last octave I banged my fingers on the 
cabinet because I didn't realize where the position of the head was in 
relation to the 
handle---OUCH!  I only did that ONCE.)  The handle is longer than my 
conventional tuning hammer, and so I was uncomfortable with my hand that high 
in the air, so at one point I started holding it in the middle of the length 
of the handle instead of the near the end and that seemed to increase my 
control.  Is there a consensus on where the impact hammer is to be held?

To any advocates of the impact hammer who would like to share some tips on 
basic technique, I thank you in advance.

Tom Sivak