Practice Practice Practice. I've asked the pro painters and they all say by hand. I'm used to using Lining Tape to make widths when painting the correct way around but it's very difficult getting it correct inside these shells due to the awkwardness and tight sections on them.
Most of us on here use Liquid Mask, you don't have to worry about blow unders in corners or anything with it. There are people who use film though, I guess it's what you feel comfortable with and what you get used to !
Hope that helps. If you get stuck post up what's stopping you moving forward and I'm sure one of us will jump in and help you in the right direction.
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