Fifth engine down the drain. 187 miles on it. wtf. Should I just give up?

People with tons of experience can do this kind of stuff. It seems impossible but they do it. I’m a carpenter and I’ve seen the guys I learned from do things I thought I’d never even try when I was learning. I saw a guy split a piece of plywood in half without measuring or drawing a line. He just ran the saw through it and made a percent straight and square cut about 1/8” off center. Another guy said he was going to mark the center of a 4x8’ sheet but for example just put an X near the center to carry on with direction. When we laid it out properly, he was dead on. Now, 20 years later, I can do some of those same things. Ie: I never was good at eyeballing level but I’d seen guys do it perfectly. Now I can eyeball a level line 40 feet long within 1/2”. I can tell metric threaded screws from standard too, by feeling the threads. I can eyeball measurements really accurately. I once was laying out these pins and got off the ladder and the boss said they’re too close together. I said I had to fill in because whoever laid them out before did a 1.5’ spacing and they’re supposed to be 1’. So these are like 9” in some spots. Then I said, “ that one is dead on 9” but this one is 10” and that’s 11” then we get back to the 12” pattern we’re supposed to have.” “What’d ya do measure them!?” He said disgustedly. I replied “No, but I still know what they are spaced at. I’ve seen those measurements so many times my eyes just know.” He got on the ladder and pulled his tape out and looked down after measuring and said “What the fuck man!? You’re within 1/16” on every one and they’re dead on centered between the two that were spaced too wide. How did you do that.” I told him I just trust my brain and eyes and let them place the pins. My hand just follows directions. The blank stare the guy gave when asked what size was probably him realizing that he didn’t check, but he held them and probably inspected them for some time. So he just did it the same way. I can totally believe it worked.