Welcome to Nico!
I haven't done it myself, but looked into it because I'd like to be sure the baffles aren't clogged (something to check yourself, while you have them off). The Chilton manual isn't specific about the steps, so there probably aren't any secret but necessary tricks. If you follow the steps to remove the intake manifold and replace the spark plugs you'll probably be at least most of the way there. There may be a more up to date guide (with working pictures) on removing the intake manifold, but here's the link for
putting threadlocker on the power valve screws (something else to do regardless while you're in there if you haven't already).
This one will show you how to replace the spark plugs.
It's recommended you buy a new gasket set for the intake manifold when you disassemble it, though if it's still newish you can probably forego that. I recommend Fel-Pro for gaskets (I used
Fel-Pro MS 96455). For the valve cover gaskets, I am planning on using
Ishino W0133-1725949-ISH since it also includes the spark plug well gaskets and valve cover sealing washers.
If you're like me and like to have a book as a guide in addition the resources here, I highly recommend getting
the Chilton guide.
As far as amount of time, it sort of depends since it's somewhat involved (not difficult, more time consuming). If you've removed the intake and your spark plugs before, then you could probably get this done in an afternoon to a day. If you can't be certain you won't need a trip to the parts store for extra tools and such, that's more time you can plan for. Overall, if you're a confident wrencher, you can easily expect to get this done over the weekend. If you're still learning the wrenchy ropes, plan for longer. Either way, take your time, make sure you keep the bolts in the right order and you'll probably be fine!
One other thing you'll want to do while you have everything apart is to replace the PCV valve. It's only accessible by removing the intake manifold and is under $10.