In addition to the great info on Tymlos sprinkled throughout this forum (and in particular, from @windyshores), maybe consider connecting with a Tymlos clinical educator? (See https://www.tymlos.com or https://www.tymlos.com/resources-support. )
The clinical educator takes time to answer all your questions and concerns, and can walk you through (virtually) your first self-injection. They are very supportive, patient, and understanding, and are there for you. (Forteo, which I'm taking, provides the same service for its patients. I found my the nurse educator immensely helpful.)
I was really apprehensive about doing the self-injections. The first one was the hardest because I really didn't know what to expect with the needle. However, I barely felt it because it's very fine, and sometimes I don't feel it at all. Subsequent self-injections are much easier and quickly become routine.
Best wishes, and remember: you got this! 🙂