I had not heard that coming from an ostomy expert, but someone posted on here once about if she had the extra time she would lay with the heating pad over top of the new pouch for 15 minutes, or so.
I do the "heat & pressure" step using my hairdryer, though. I heat both my Eakin and my wafer prior to applying each. Then for 3 mins or so, I alternate heat from the hairdryer and pressure, back & forth, once my wafer has been applied.
Something clicked when I started using a whole Eakin with the Convatec Convex Moldable and the "heat & pressure" step. I went from 2-hrs to 2-days wear, to 7+ days with this set-up.