That is why, when I ran shops, my tech could beat book time that I sold the job for and he/she did that because they had the right tools and knowledge. That extra money he/she made by getting right on the next job quicker, was a way for them paying for those expensive and proper tools they used.As a young guy (36).. who is in a unique position (my wife and I have a house on the same property as my parents) which helps alleviate some of the dumb money decisions we made early on.. we are fortunate that we always have at least 1 spare vehicle during long repairs. This alone helps. I was able to spend 6 weeks messing with the wife's Yukon between the cooling system and pulling the head to get a broken bolt out. I don't even know how many hours I spent letting it heat up and then cool down to work on it.. but I bet I would have had at least a few hundred dollars in labor saved. And now I know more about my vehicle which is nice for when we are on long road trips and may have issues 100s of miles away from help.
Also.. buying tools for specific jobs . I used to think 'is x dollars worth it? Meh probably not I'll only need it this once or maybe a 2 time'.. then I bought the wrench for pulling mechanical fans off.. I feel like I'm cheating at that game now. What used to be 5 or more minutes of getting an old belt and vice grips lined up and on.. I can now get them off in about 30 seconds with far less effort and no chance of hurting myself or the part.. I now buy the correct tool for certain jobs lol