If you are patient and wise enough to want to be "just" an employee (unlike me), learn the requirements to install solar in your state. That will determine what your first steps will be to get into the industry. For example, in Minnesota, you basically need to be a licensed electrician or working directly under one's supervision to even touch solar panels; taking classes at a community college and/or getting hours booked with a journeyman doing any electrical work will position you well for an apprenticeship at the union JATC. In other states, you may be able to work for a roofing company that does solar - if you are willing to work hard, this is probably the quickest way in but roofing is grueling.
In either case, getting a NABCEP PV Associate certification can give you a leg up on others, but it does require some study and taking a test (not too hard but not everyone passes the first time).
The work itself is not so complicated but there are many small things you can learn. Pay attention to each small thing that more experienced workers do, and you'll understand the whole thing in no time.
If you are in one of these states, you can expect that there will be growing job need for trained installers. A foot in the door for this job is a volunteer experience that asks for solar roof installers, see SunWork.
• Use proper protective gear –Glasses, Gloves, etc. to reduce the risk of electric shock.
• Do not wear metallic jewelry while working with any electrical circuits.
• Hold solar panels with two hands while transporting. Do not hold by the junction box or wires.
•Keep the solar panel covered until after you’ve mounted and made all electrical connections.
•Be careful not to touch any live positive wire with a live negative wire.
Fundamental steps followed in installation process.
Step 1 –Plan your Installation.
Step 2 –Route the Wire.
Step 3 –Mount & Wire Solar Charge Controller.
Step 5 –Connect the Battery Wires.
. Engineering projects can generally be broken down into the following phases.
1. Planning / Preliminary Engineering.
2. Detailed Design.
4. Construction / Implementation.
Each phase has its own set of challenges. So calculations part comes up as a part of Planning and Design. This creates a mental clarity and helps the planner to work on approvals and generating process plans. So I would say its solely left to an individuals likes, dislikes and inclinations. If you like playing with measurements, numbers, analysis, specs and specifications you will enjoy. If you like going out, talking to people, field trips etc, Construction and implementation will be enjoyable.