Thanks buddy...I'm hearing impaired and have done several self impressions so it is a given for me but for the general public I tend to agree that a specialist should do the service. The risk lies in damaging the eardrums prior to the mold injections. Next is the 'fullness' of the impressions. Anyone who is a rebel and wants to do this....keep in mind : cotton swab not too deep b4 injections and open jaws while impressions sets. Again....best to have it done professionally.