One problem that many rehabbers overlook is that you run the risk of buying a place at "market value". In economics that is the price agreed upon by a willing buyer and a willing seller, under no duress, agree upon. If the property is "known" in the marketplace there will be enough potential buyers to keep the price from falling to below market.
If you're hiring contractors to do the work you, or any other buyer will pay market rate for that work. If you pay market rate for the property and for the repairs you'll have a property that you've bought for FMV. Where will your profit come from?
That's why many of us work hard to find "off market" deals and either have someone who will do QUALITY work at below market rates; a skilled handy man or do the work ourselves.
When I was doing most of my buys and flips I had a very good paying, salaried, job. There were weeks I worked 60 hours but it was generally doable for me to arrive late and or leave early, I just needed to be available on short notice. My office and house were six miles apart and everything I invested in was within that radius.
Generally I learned how to do more difficult projects by finding out a simple repair, a small bit of bad sheetrock had a bad stud and window framing behind it, etc.
Despite my job and good education, MBA from a well known school I've done roofs, installed piers under a cracked slab, added a couple of half baths-doing all plumbing myself, installed more ceramic tile floors than I care to count, etc.
Either learn some estimating and construction skills or look for projects that will create a major payoff from small changes.
You're doing great, keep it up.