Like any MS product really. The worst part is the Undo button. If you fill several areas with different colours, and the last one leaks out, the undo undoes ALL your work.
ARRRGHH!! I find I have to work with the zoom buttons, until the pixels are the size of pennies. It's the only way to get it right! Most time consuming too.
However, Paint IS easier to use than Photoshop, and it's free. Which are two really nice saving graces! <IMG SRC="http://www.keenspace.com/forums/smile.gif">