RE: If I switch props will it slow me down on approach?
Yup, that's the gist. Remember, if you feel the controls starting to mush up (ie, impending stall), or you're not gonna make the field, add a click or 2 of throttle. If you leave your elevator about where it is, this'll stretch the glideslope, reduce the decent rate and keep the plane in its current attitude. Then, cut the throttle back again when it's appropriate.
Go back to your training days (not so long ago, eh?), and do just what you did then. Land at 50', 40', etc. etc. using these techniques.
It will come, but it takes practice.
Have fun!
J