look up curve-ease and get it. their website has an awesome video-tutorial. It works wonders on the awkward sides and back of the wingback chairs. secondly, make sure you have lots of time, and lots of extra fabric. I would suggest doing a mock up of the harder parts with cheap muslin, so you don't screw up on your expensive fabric. with that said, don't skimp on fabric. you want it to hold up long enough...no one likes redoing a reupholstery job because the fabric wore out. take off each piece one at a time at the seams, you're going to use them as the pattern for your new fabric, so resist the urge to tear it all to pieces. for one, take pictures of the chair (or do one at a time) so you can remember how things are pleated/folded around the edges. start with the dust cloth at the bottom, get strong needle nosed pliers and pull up all of the visible staples. remove and set aside. you'll be able to see the staples along the bottom holding the leather down.. remove those. you'll be able to tell which side went on last, based on how the fabric is wrapped. it always helps to take pictures after removing every piece. I always have a sharpie with me and I label each piece I take off, so I know the order it needs to be put back on in. if you have pieces that are sewn together (commonly on the arms of chairs) carefully cut the seams until everything is separated. repeat until you're down to the foam and batting. if its in good shape, go ahead and re-use it. note: I always add or re-wrap in new batting. over time the original has been compressed, and if your going from leather to fabric, you're definitely going to want to add more. if you do need to buy new foam, get the Joann fabrics app and use a good coupon... that shits expensive. once again, don't skimp. get the good stuff. my rule, don't mess with springs or the frame. if they need repair, unless its an antique its not worth the cost. so. re foam, make sure you have supplies and equipment (a good staple gun, plenty of staples, curve ease, needlenose pliers, hammer, scissors, fabric, sewing machine if necessary) Take your time and start with the last thing to took off. work carefully, make sure you pull the fabric tight enough over the frame. DON'T move on to the next step until you are happy with the current one. if something looks crooked, take the time and pull those staples... it is not worth backtracking 5 steps to fix the 2nd thing you did. if you have any questions, PM me. I'm not a professional, but I've been sewing for 15+ years, and reupholstering as a hobby for 3. You can even send me a picture of the chairs and I can give some more detailed instructions. More on reddit.com

Yes, you could do it. That doesn't mean you necessarily should because it's a hugely different skillset to what you have now. It's absolutely not worth it unless you're the kind of people who love learning new skill and buying new tools and don't care that it'll be an economic disaster. If you'd love the chair more just because you're the one that rehabbed it, then that's another reason to do it yourself even though you'll take a big loss doing it. I don't think you'd make it more expensive to get rescued by a professional if you got in over your heads but one should never underestimate the public's ability to turn something into a dumpster fire. Basically upholstery isn't hard to understand or overly complicated but there's a TON of specialized techniques and tools required to do it passing well. If you think that sounds fun, go for it. If you thought it'd just be a way to save some money, you're absolutely going to spend more doing it yourself the first time than a shop would charge to do it. More on reddit.com

Easiest thing to upholster. Turn the chair over. The seat usually just unscrews. Take the cover off, trace, and cut. A cheap electric staple gun or even heavy duty manual will do this job. The back in not sure. More photos might help More on reddit.com

As a diy project I would have some 1/2 plywood cut to fit over the existing frame. I would secure that with a couple of screws. Put some 3/4 bonded foam (carpet pad) on the plywood. Would then put 1 1/2 inch firm foam on top of that. Then a layer of Dacron from the bottom edge over the foam to the bottom edge. Then cover with fabric. More on reddit.com