Pay to have it professionally done. It’s very affordable and the impression really makes or breaks the comfort and satisfaction with the IEM’s, which even if they are lower end will cost far more than the impression fee.
I’m all about DIY in most cases, but there are a lot of advantages having it professionally done.
Having someone with the knowledge of if you need an open or closed mouth impression, having someone able to look in the ear and make sure there isn’t any pathology which would be a contraindication to doing an accurate impression, and really just being able to make sure what you send of looks right and will perform right.
I have vendors supply my impression guns, assortments of impression materials, etc, so when I create one if there is a void, some wax or hair issues, didn’t look deep enough etc, I just do another. Heck, I usually do 2 just to see if there are differences, cost me and the patient just a couple extra minutes time, right ? Your just not saving much DIY and giving up quality.
Also while rare, there is some small risk of DIY. Don’t have an otoblock in right, or certain ear pathology, and put impression material in there ? You might be getting it surgically removed.
See an audiologist for it.