Anyone drill thru a corian counter top

Forstner bit or maybe a brad point bit and start slow. :)

and keep the drill speed down

I drilled a hole on mine with a regular hole saw. Steady pressure and it cuts like butter. No need for any lube it will plug the teeth.

As noted by everyone above it is really not a problem. However, just to make yourself more comfortable, try stopping at a counter top installer/store and ask for a scrap of material. Then give it a go with your drill. You'll see it is easy and it will give you more confidence before you have a go at the counter.

Get a hole drill of the needed size with a pilot bit. A tablespoon of detergent mixed with a cup of water will give you all the lube you need to keep from melting the corian. Just apply it with your favorite basting brush and you'll good results!

I like to use a center drill first for anything accurate or a with a chance of slipping.

Suggest using a lubricant while drilling. Even just water...assuming your using a cordless drill.

Drill a small pilot hole - smaller than the center drill on the hole saw - as a guide before you go with the hole saw.

All the above. Just like drilling thru wood but a harder surface. You can do it.
Don't push too hard when coming to the bottom of hole.

I'd put some duct tape down to secure the drill area and minimize scratches...