Before you remodel/renovate, make sure the infra are good in the house (electrical, plumbing, structural, etc). Invest in those things first, then do the more fun things.
Save money where you can by doing things in your wheel house, as mentioned there are great videos for things like tiling, basic plumbing (toilet installs, faucets, etc), painting, replacing switches/fixtures. I've also had buddies come over to help with drywall and I learned a ton from them, I paid them but now it's something I can do some basics with.
But don't be afraid to pay for the expert when you're uncomfortable or if it's a big job that would take months. Of course you'll pay for it, but I've found paying someone to do some things were just 100% worth it. For example, I've always done my own painting but I had a stairway and kitchen that needed new paint, and I had just done my cabinets and didn't want to screw them up. I had a guy who helped install my flooring who does a good job at a good price and he came over to do those two painting jobs flawlessly and I didn't have to disrupt my kitchen or whatnot for an entire weekend, trying to do ladders on narrow stairs with paint, etc. Worth the money to me to get it done right without the stress.