I personally know two transwomen who had. One started with medium dose estrofem and full dose androcur, prescribed doses, she just followed internet advice instead of doctors, and took estrofem sublingually. She had severe endocrine complications including problems with thyroid and liver. She had to stop HRT for more than a year, and slowly restart after thyroid and liver functions had been back to normal for more than 6 months. She then started with half the dose orally not sublingually, and one quarter dose of Androcur she was initially prescribed.
Second one bought hormones over the internet.. she took only estrogen, higher dose than what I take after years on HRT, of course sublingually like the internet suggests.. and she ended hospitalized after one week. I dont know much details.. havent seen her or heard from her since.