Welcome to CC!
If you follow the tutorial on here they aren't as hard as you imagine. You could make it just one tier to get a feel for it. You can get about 30 servings(maybe more) out of a cake using a 10/9/9 combo. But if you want to try a two tier the biggest advice I can offer is to make the bottom layer of the top tier at least 4-5 inches smaller than top layer of the bottom tier.
And use a cake recipe that is firm to help with stability.
I don't have the plate system that BKeith uses so I use wooden dowels and covered cardboard rounds.
I also popped my top tier in the freezer to make it easier to handle and get into place.
Good luck with it!
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