I've found using post-it notes is a lot easier than masking tape altogether.
You dont have such a faff getting a crisp edge as you do with a long run of tape, they come straight off easily and you can reuse them several times, so it's not as expensive as it might sound.
There are different grades of masking tape, and the use different adhesives, Some can be removed with warm water, some need white spirit or methylated spirit. But 'Sticky Stuff Remover', from your local discount hardware shop will remove them all, and is handy to have around the house, too.