Hi all I need advice!

I currently run My X19 with an UNO 1.3 Turbo in. How difficult would it be to drop either a 1.6 Thema Turbo or a 2.0 Thema turbo into it. I am not really a mechanic but know the basics. Any one have any ideas?

I have attached a photo of me racing it at Harewood Hillclimb in Yorkshire. Or at least I hope I have. Please respond anyone who has more mechanically knowledge than me.....which is probably anyone reading this right now