Please don't talk about stage 1 mods - you mean cosmetic changes that don't make your car go faster. If you have a quality fmic and you can install it yourself go ahead - it won't make your car go faster but it will come in good stead when you get a bigger turbo - which will really make your car go faster if done properly.
Don't worry about getting a tune - if you have a stock ecu its not tunable and all they can do is check the timing and if you buy or borrow a timing light you can do that yourself. The most cost effective way to make your car tunable is with a Nistune chip so do some research on aftermarket ECUs : Nistune chip, PFC, Adaptronic, Link etc.