no too difficult, does car have vinyl top, and or molding around window on out side, and do they overlap on corners and bottom center
best way with vinyl top is to cut out from inside, removing inside trim and with razor knife cut they urethane bead of adhesive sealant to get glass out, clean off all excess sealant, and apply glass primer to glass and bead of urethane around opening and set glass into place, reinstall inside window trim. urethane sealant and primer about $30 at parts store, note most glass shops charge about $60 to $80 to install new window just for your info, case you think it might be too difficult or time consuming.
WINDOW INSTALLS FROM OUTSIDE BUT HAVE TO CUT ADHESIVE FROM INSIDE,
MOLDINGS ARE CLIPPED ON PLASTIC RETAINER CLIPS SOME COULD BREAK TRYING TO REMOVE, THEY DO MAKE A HOOK TOOL TO HELP DISENGAGE CLIPS BUT CAN'T FIND PICTURE OF IT, THIS SHOULD BE CLIP