Your house is going to smell bloody lovely. Wash your hair before the party and you'll be fine. And if there's a faint waft of garam masala as you pass someone - that's no bad thing. Could be far far worse.
Just to add that I've since moved on from The Curry Secret - this site here: Secret Curry Recipes houses my current favourite recipes (start with a base sauce and then use that to make the curries). Some of it requires a subscription to access, but the basic gravy recipe(s) and popular curries like korma, madras etc. are all free. Also check out Curry2Go on YouTube - the guy's name is Julian, and he has an e-book of his recipes on sale which I find very good.