Template, sharpie, centre punch, stepped drill bit, hole saw, sikaflex, file, rust proof paint, cordless drill, and plug in drill for the hole saw if you have it. I reckon I spent about $100 on extra tools. Better then paying $300 for the install (price quoted on line).
Disconnect the battery to stop the airbag going off when drilling into the A pillar (not sure if this an actual risk but the Safari instructions said it was).
Start your holes with a smaller drill bit for pilot holes and gradually get bigger. Centre punch and pilot holes should keep your hole in the right location.
I did it without taking the front wheel off. I reckon this made the job quite a bit harder. If you take the wheel off make sure your workspace is safe and you're not in danger of the vehicle dropping on you.
The Safari instructions are excellent. Just follow them.
I munted a few of the plastic screws during the job. They can be replaced.
No noticeable performance improvement but the noise of air getting sucked into the snorkel is cool.