However, if you're short of time, using premade green curry paste (sold in packets in the supermarket) is perfectly fine.
The key to making really amazing Thai food though is to get all the ingredients right. Don't try to substitute things. It just won't taste the same. Get real kaffir lime, proper full-fat coconut milk, fresh lemongrass, actual Thai eggplant.
@applebottom That's a good tip! I'll have to see if there's a grocery near me that stocks those items. I know the supermarket by us doesn't, but there are some smaller ones that might!