It's very outdated to DiY-bodge bodywork and hope to get a half-decent result (I hope you aren't in the trade). If you value the car and how it looks, ask your preferred bodywork man for a free estimate.
Ooer. Outdated. The horror!
OP, depends what your objective is.
If you want to massively slow down the rust, that needn't cost very much at all, although of course it will be some work. Not highly skilled work though.
OTOH, If you are after a cosmetic repair, (which is usually the case), that is likely to be more work, more expensive, less long lived, and more difficult.
IF I had a car I cared about cosmetically (never have, but it could happen, I suppose) I think the best combination might be to deal with the rust first myself (which I suspect many pros wont tend to bother with very thoroughly, though there are probably honorable exceptions) and then get someone else to make it pretty.
Edited by edlithgow on 18/04/2020 at 12:25
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