I wouldn't say that it'd be impossible but definately more of a pain than it's worth as for beginners, the opening has to be precise and exactly like the OEM car w/SR, probably require a body shop to do it right. You must then drop the headliner, connect drains, wiring, etc and the headliner is likely to need modifying as well.
For the time and hassle factor, I'd get an aftermarket SR installed instead BUT beware that most SRs are more of a pain than they're worth. Sooner or later they'll all give you problems.