:iagree:with the 105 comment! If you are new, you will never E-V-E-R get the hang of it! Especially without doing a lot of test spots, different pads, different section passes, etc. With 105 you have very limited working time. Do a very quick spread and if you're lucky, you get 2 medium speed section passes. Work it 60 seconds and it'll clump up on ya.
You might try the Ultimate Compound, not quite as much cut but it'll work literally forever. If you work say 3 to 4 section passes it comes off like it's not even there. Over work it, do 6 to 8 passes and even if it dries out it'll still come off. (Always easy to just put a little more on to wet it and it'll slide right off.)
If you really want to step it up, RUN don't walk and get a bottle of 101. Holy crap do I love that stuff! Just got my new bottle last week and it's fantastic. I may never use 105 again. It doesn't work as long as UC, but it'll work till it it's hard to remove yet not clump up. I tested it from a really short to a very long time and it really didn't matter. (Again, just wet it with a little more on the pad and it comes off ALMOST as easy as UC.)