Have you thought about going in the Automotive or Diesel industry? There are many different factors when choosing which field you should go into. I will give you my two cents on both fields.
Diesel-Generally when your working on diesel engines they are a less complex to work on depending what vehicle it is in. The parts on diesel engines are bigger which can be a good or a bad. While working on trucks you will be climbing, crawling, lifting, pushing, and pulling. Most Diesel shops have more room so you will not be shorted for space. It has been proven by www.payscale.com that Diesel technician generally get paid more. Most Diesel technicians get paid salary or hourly.
Automotive-Working on cars they are obviously smaller which make it more cramped to work on. You will be do less crawling and climbing due to the fact that you are working from a lift. Automotive industry you are either going to get paid hourly or flat rate. Technicians are required to work at a fast pace to get the job done asap. Working in the automotive industry tends to be less greasy.
Note- If you want to work in Automotive or Diesel you better develop a strong mindset. More technicians will talk trash to you. If you cant handle this I would recommend you do something else. COME BACK FOR MORE INFORMATION!