After 10-20 minutes (I left mine in for 20 minutes just to be sure), s-l-o-w-l-y pull the top part of one ear away from the mold until it releases from the ear. Do the same at the bottom of the ear. Then s-l-o-w-l-y grab an edge of the mold and pull it out. Do the same for the other ear.
If done right, you’ll not have sucked out your eardrums (remember, s-l-o-w-l-y) and you’ll have something that looks similar to these.
Don’t handle them. Let them sit to cure for at least another couple of hours or longer. Trust me, rushing at this stage leaves fingerprints all over them—don’t ask me how I know this.
Now that the molds have cured, pop out the in-ears from the molds. This leaves an impression and a hole. Take the small drill bit and turn it by hand to go into the hole. Then drill through to the other side. You may have to tweak the hole somewhat to get it to be big enough for all the sound to come through.
Leave the new in-ear molds to sit overnight to fully cure. The next day, pop the in-ears back into the molds. Carefully, with some finagling, the molds will fit into your ears. Pulling up on the ear might be required for proper seating. In my case, I had to push a few times to get it to seal. Might have to do with the fact I was talking to my kid while the mold was curing in my ears!
How do they sound? Pretty good. They definitely seal better than my silicone buds and that makes the sound a lot clearer. For 10 bucks, it’s a worthwhile upgrade.