Over 50 years making my living working on fluid systems in cars, trucks and hydraulic construction equipment, and never had one machine that I had to send to the crusher because I couldn't bleed a fluid system properly. It may not be easy, and it can be messy, but it's surely doable.
As I said, earlier, some people just can't wrap their heads around the properties of physics, and have trouble bleeding fluid systems. Understanding how these systems were engineered to work tends to make the process easier.
I guess you have to know how physics work so the air doesn't outsmart you.........
