If you can fit into the public session times on the MAIN rink at Ice Factory, that should be fine. The picture of public skating shown on the website is the main rink. It's standard 85' X 200' size.
Especially if you go for a morning or early afternoon session, you should have room to skate...or sufficient wall to cling to, depending on your skill level.
I wouldn't waste time driving down to Kissimmee for the Studio Rink, though. If you haven't seen one, you have no idea how tiny 45X85 is.