Tudy,

Welcome to the wonderful world of sailing. Sailing solo on a H14 should be no problem for you. Here's my few words of advice:

Think safety - I always wear a life jacket and carry:
VFH radio
Cell Phone
GPS
Tow rope
Anchor
Knife (attached to lifejacket)
Solo righting pole
I would reccomend the mast float - they do work. People don't use them because they think it slows them down too much or that it makes them look like an amateur.
I would also reccomend going out with someone who sails a cat. The H14 is a great boat but it does have some specific sailing techniques - mostly having to back rudder when you can't make it through the tack. Don't be afraid to ask for help - we're all pretty friendly and don't mind a bit to help with advice or raising a mast. Another good place for info is the old Hobie list, now at http://www.thebeachcats.com .
Good luck,