First of all, please don't laugh at me - I admit to being n00bish

This question is directed primarily to those with experience glazing windows
with DAP 33.

I have a wood frame, and a 8x10 piece of glass. The rabbet is 1/4 inch. I
lay down a small bead of putty (DAP 33) into the rabbet. I press the glass
into it. So far so good, looks good. Fits nicely. I install a glazier point
in the middle of each side, four total.

Now for the fun part. I get a nice glob of putty, roll it into a ball, warm
it a bit with my hands, roll it into a rope and press it into the groove. I
take my putty knife, and try to run it along the grove to make a nice flat
surface. I'm finding that no matter how I do this, the knife pulls the putty
and I don't get a smooth surface.

I watched a video of someone doing this, and he made it look real easy.
Bah.... I tried a plastic putty knife, a metal putty knife, plastic caulk
smoothing gizmo that is supposed to MAKE CAULKING EASY ONLY $19.99 (actually
cost about three bucks) and same problem. It pulls the putty and I don't get
a smooth finish. Hold knife flat, angle it up, etc. Pulls putty.

So - what am I missing? What is the trick to doing this with DAP 33 so that
you get a nice smooth finish? Warm it? Cool it? Mix in some linseed oil?
This can't be that difficult....