Gone as in there is nothing left of the filler or is it just badly degraded?
Assuming you can find some color matched epoxy you will still need to buff
it out when finished, (there's more materials and tools you need). It
doesn't sound like an expensive job for a pro, I would be inclined that way
even though I might be able to figure it out myself in time. No research
and it gets done right on the first try.
I don't think it is difficult but I do think there are specialized tools ( a
decent buffer and angle grinder) and materials (multiple sanding grits and
polish) that might make it more expensive than necessary for DIY. If you go
that way, you'll be ready for any scratches too.
And don't forget about that experienced touch that only years of doing can
give a tradesman.
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