Get a life, stop attacking people .
Look, the place a come from, you just wear a blue overall, find a 18mm long wrench for one hand, a dirty white wipe cloth stained with black spots inside your back packet, with the other hand you put black grease sporadically in your face and overall... and you ARE a mechanic.
However, such won't work in many places.
Car mechanics, plumbing, carpentry, plumbing, and more, those require
training.
There is nothing against people as to say, the government is trying to make hard for people to become an electrician.
But without training you can cause fires, floods inside the house, destruction of property, and worst, you can even cause death of people if you don't know what are you doing.
Besides of knowing how to use tools, and repair existing plumbing, and install new pipes and features, you must learn to do it according to the correspondent code.
Codes are made for protection: SAFETY
For example, you install a new electric circuit in your house using the wrong size of wiring, and you have installed an electric heater.
The cable you used was gauge 18, and was not insulated for other purposes but for installations in devices like floor lamps, radios, etc.
The required gauge was 12 for your electric heater (which is thicker and handle more amps and heat). After using the electric heater the cable you have installed heats up and burns the insulation and causes a fire.
After the fire has been extinguished, the inspector finds the fault, which is the improper cable. You try to collect money from the house insurance but your claim is denied. The reason is: you caused the fire when using the wrong cable.
Same will happen to you if you don't learn plumbing in school or working in that trade for years and gaining experience.
Learning the trade and the code is for saving lives (your life first), avoiding damage to the tools and equipment, avoiding destruction of the premises. SAFETY is first, and school and training will teach you that: SAFETY.
I'm glad to hear you want to learn a trade, but please listen to the ones with experience. I have had myself a trade license, and I renewed it every two years, until I didn't renewed it anymore, but my knowledge stays.
Please, do the right thing.
Getting a trade license is not "that easy", but others did it, because they wanted to become plumbers, the wanted to become electricians, they wanted to work with a license in construction business.
Then, you don't need to answer this questions to me or the others here.
Do you want to become a plumber because that is really what you feel attractive to do? Because you like seeing you as a plumber?
If yes, I can tell you that
if you are good working with your hands, then you will be a plumber.
If no, then you better have your plan B, which is another job you think is suitable for you.