"It does shorten life spans. Especially for women transitioning to men. The testosterone causes a lot of damage to the heart. The rates of self-harm also only increase as someone transtions as well. 3-4x more likely than cisgendered individuals just identifying as trans up to 12-13x more likely post-op."

Are you sure about that? If the level is similar to a cis-man it shouldn't do any damage to the FtM person.
Sure it might do damage, if it's overdosed, but that you can say to most stuff that is overdosed.
If testosterone was that bad, then every cis man would have problems, because of it.
But that's why good doctors do blood tests, to check if the hormone levels are normal.
As a transgender myself and being friends with trans people Im good informed about this stuff
most dangerous thing itself is the Operation below. Because you need really to choose a good doctor and see their results.
I know someone (another person that is MtF) where the doctor did a mistake and they now have to wear a urinary catheter
the Doctor himself was an unknown one