since I want to hand sew my own clothes and stuff I need decent tools, including dressmaker shears. but a reputable one is an investment, and I already splurged my spending money on ropes 
I have these shears lying around that are from a reputable brand, but they're in terrible state 
can we make these become a "decent tool" again, and avoid more consumption? I guess if you disassemble them, vinegar the rust away a bit, then file away the rest, then sharpen… I've never tried sharpening scissors, but I have a whetstone somewhere… could even spray that handle to redo the painting while I'm at it?
@elilla My experience is with workshop tools rather than scissors, but that doesn't look like particularly much rust; I expect that they'll be recoverable with something that removes rust. Vinegar should help somewhat, though I usually use WD40 (or the generic equivalent), it seems to work a little better. Not sure how to 'properly' sharpen scissors though.
