I can't tell you from experience because I still haven't performed this mod but have done some research I can share. Here's a pic of the spots you want to drill out.
https://imgur.com/a/hYGz7You're going to want to mark the case where the holes need to be and drill through with consecutively larger drill bits, 2mm/4.5mm/6mm.
The case is supposed to be very soft plastic so you're going to want to use the lowest power setting to prevent the case from cracking. You should be able to drill through very easily.
If you decided you wanted to mod your keycaps instead you'd just have to partially chop some of the stabilizer stems off of your shift and enter key. I'm drilling the case instead because I like to swap my keycaps around and would like to still have the option to sell/trade them unmodified.
I'll be performing the mod on Friday so I can get back to you then and let you know how it went and share some pics of my experience.
