Questions Regarding Compounded Doses!

I am taking mounjaro currently but looking to swap to compounded tirzepatide due to shortages and the hassle on finding the correct dose when I have an increase.

The compounding pharmacy local to me with the best reviews only has the manual syringes and not the auto syringes that I am used to!

Does anyone here have experience with those? How hard are they to deal with? Is getting the correct dose difficult? I am also scared of air bubbles!