You can get the Nissan kit for substantially less online. NissanPartsDeal.com has them for $217.80, and because they're a Nissan OEM retailer, the kit will come with the Nissan factory parts warranty just like a dealer part.
The airbag isn't really difficult to remove. The only secret is to not push your pick too far into the slot. If you go too far there's a plastic wall that will prevent the pick from pushing sideways. You have to slide in slowly, feeling for the tip of the pick to contact metal. When it does, stop immediately and push sideways. Easy-peasy once you do it a few times. The only other tricks are 1) DISCONNECT THE BATTERY NEGATIVE BEFORE YOU START, 2) make sure the front wheels are in the straight ahead position after removing the bag but before removing the wheel, and 3) take note of the match mark positions on the wheel and shaft, they're usually very slightly off from one another and you want to reassemble in the exact same spot. I usually use the straight pick from this Harbor Freight set to pop the bag, it's $1.50 and just the right diameter to work the slots:
https://www.harborfreight.com/mini-pick ... 63697.html