Front brake pads as well as rear brake pads are quite easy to do on Sequoias. Couldn't find a site specifically on Sequoia's but here are two sites that might help you out.
http://www.atomineer.com/redmx5/mod_brakes.html
http://www.danoland.com/nsxgarage/br...frontpads.html
There is a bit difference between this set-up and yours. But it follows the same principles. Just remember SAFETY is first. Make sure your SUV is on a flat surface and well supported with jack stands. I've done my pads twice and used brake pads from Auto-Zone for about $20 and the good thing is that they're lifetime. Also expect to have your rotors turned. Pep-Boys will turn them for about $7 here in So. Cal. but only if they have the appropriate width. Hope this helps you out.