I think those projects are totally doable and you'll learn a lot from them. The advantage of doing them yourself is that you can afford to make some mistakes and still come out ahead compared to hiring. A couple of comments, definitely find a local landlord friend who you can bounce ideas off of, though a word of caution they may not care as much as you about doing things "right," just "fine enough." I had good luck hiring a handyman to help make the work go faster, and he taught me a lot. I paid him $20 an hour and he was capable to do windows, concrete, trim, appliance installation, fencing, framing, electrical, painting, drywall. That said, I'd fired 2 before him. It may have made as much sense to forgo value and get someone really good from day one, and pay them $50 an hour and really learn from their experience.
Lastly, don't discount talking to people at Home Depot and Lowe's. Some of the staff are actually pretty competent and I learned a lot of helpful procuedures talking to them. They also know the local housing stock, and so for instance, may be able to tell you some of the particular ways to install replacement windows on a house that had steel casement windows. That was a localized situation they helped with, that Youtube didn't show.
As for one other suggestion, if the projects seem big, consider hiring someone to do part. In my area, tiling a tub surround costs $300. That is crazy cheap in my opinion and a way better use of money than my spending 2-3 days on it, plus it looks so much better. Similarly, I can build cabinets easily, but it is also really simple to buy the boxes from Ikea, assemble them in an hour, and then just make door and drawer fronts.
One bonus piece of advice, since you're DIYing, you can do it however you want. i.e. use open shelving instead of upper cabinets, save yourself some time, worry less about an uneven wall, and buyers will like your kitchen better.
good luck!