Before you even consider TRT you need to have an extensive amount of blood work to determine where all your hormones levels are at before any clinic will even consider it. Red blood cell, test, estrogen, cholesterol, lipids, ect. Most clinics wouldn't even consider you if your test levels are just under normal. Some clinics use loop holes by setting the minimum test levels at the highest rate possible so they can take a huge chunk of the market. Those clinics are more than likely not in your state, so you would have to do it all online like most TRT clinics.
Once you start taking it, after a while you body will stop producing it. Some guys who stop TRT after a while end up having lower T levels than before they started, on top of their body never being able to get back to those levels. Hell I've heard of guys taking test for 3 months then stopping and having permanent damage to their T levels. A good knowledgeable clinic will also prescribe HCG with your Test which is also another injection you will need to take. HCG in short will trick your balls to keep producing Test, rather than shut off natural production.
Others clinics are strict with their minimum tests levels are just under normal. It is a life long commitment sticking a needle in your body on average of 2 times a week forever. Then you factor in the risk of hitting a vein, nerve, scar tissue buildup, mood swings, having to get tested every so often to see where your levels are at, dying earlier than you would have, ect. Yes, it can be a positive life changing thing if your test levels are extremely under average. Testosterone is one of the main reasons men die before women. Its an amazing hormone, but it comes with a hefty price. Some men have high estrogen and low T.
There are ways to cheat your testosterone blood test to show lower than normal. Taking your test in the morning when your test levels are at their lowest or eating a really fatty meal like a burger n fries which drops your test levels. Most clinics wont allow you to take the test in the morning for that very reason and they also make you take it on an empty stomach. In closing you'd be surprised how easy it is to naturally raise your test levels. Try that first. It is nice to know where all your hormone levels are at regardless. There is a lot more to this but that info will give you basic outline of what to expect.