I learned alot from my dad when I was a kid,watching and helping him restore/repair antique cars (teens,20's-50's).Started as a mechanics helper at an I.H. farm equipment dealer when I got out of high school.2 years later,went to work for a heavy equipment dealer working on bull dozers,motor graders,cranes,excavators,rollers,back hoes,forklifts,etc.;-I.H.,Galion,Northwest,Liebherr,JCB.Eventually became a field service technician,covering 3 states.Did this for 7 years.
Then went to work for a coating contractor-sandblasting/painting ships,barges,towers,bridges,etc.Alot of rigging and setting up eqipment involved and working at heights.Very dirty,dangerous work,but made really good money.
Since been a maintainance mechanic at a marina-electrical,plumbing,maintain/operate boat lifting equipment,welding,fabricating,wood working,as well as yacht repair.
Over the years have aquired a vast learning/knowledge and tool collection-enabling me to repair just about anything that moves.I could not begin to list the tools and equipment I have,much less even what I have (money wise) in tools and eguipment.
The good thing is, they are MY tools,enabling me to not only perform my daily job,but also do jobs on my own time making my own money (side jobs).You'll find out that you never have enough tools,as designs and fasteners change with the times.
A big thing that comes in handy is being diverse-learn everything you can about everything.Learn-practice sound mechanical skills and procedures.Watch and learn from the "old-timers",don't hesitate to ask dumb questions,because dumb questions are questions that are'nt asked;and by all means,don't be afraid to open a book.Always stay warm and have GOOD shoes.
Ah,the physical toll...I'm only 48,and suffer bone spurs in both elbows,degenerative arthritis in ALL my ankles,have Carpel Tunnel in my right wrist,have been been severly burned/set on fire,have had metal chips shot at and in me like bullets (yes,wear eye protection when striking),broken bones,countless head injuries,and a host of other injuries I have forgotten about.
But this is what I enjoy,otherwise,I would'nt have been doing it for so long....I love to jump in,and now am learning about Rangers,as I now own one,and do ALL my own work on my machines including a Mazda,Jeep,Harley,Detroit diesels (2 in my big boat),and an Evinrude outboard (speedboat).
I can't tell you do or don't.....like others have mentioned,I'm only stating the realities/my personal experiences..But get into something you love.In todays conditions-stay diverse.