It's pretty simple actually. Just yank the old one out and press the new in
by hand.

This should help:
http://www.tegger.com/hondafaq/misc/92-95_civic_2-dr_windows.pdf
It's 492kB.

You will need to remove the glass, which is easier than you'd think. And
watch for sharp edges inside the door.

Remove the interior trim panel and peel back the plastic weather sheeting.
The window is held in by two widely spaced bolts at its bottom. Wind the
window down until you can get at those bolts. Unbolt them, slide the guide
back, tilt the window and the glass just lifts out. Don't drop it! It's
heavier than you think.

Make sure you re-seal the weather plastic at the bottom, otherwise you risk
water drips onto your door sill scuff plate.