The crank nut will be tough as unless you are on a proper ramp you will need to use an socket extension bar to get your pull bar to clear the wheel arch. People normally support the extension bar from underneath so you get rotation on the nut without any bending otherwise the socket will slip off. You will probably need a 3/4 socket extension and a strong pull bar , then the longest scaffold pole you can find to slip over the pull bar. Then a friend in the car with it in gear an foot hard on the brakes. Hopefully it has been cracked before and not put back on as tight. Otherwise it can put up a bit of a fight. easier with a big ramp as you dont need the extension bar and you can wrench from underneath. Not sure whether a DIY or normal workshop impact wrench will be up to the job, could be wrong but I have reciently used some pretty powerfull air impact wrenches up to 2000Nm on 50mm bolts in work and we ended up using a very long pull bar instead as constant torque seemed better than hammer torque. Happy to be told otherwise though.
This isnt a job for the faint hearted, its not as easy as an old ford. Unless you really want to do this and are fully tooled up, I would say cost up the option of getting a specialist or autolusso to do it, they have all the tricks and experience to do it quicker.
DIY it will take you 2 days. The belt and tensioner kits are not cheap, combine the cost of unique tools , so when you work out the labour cost you may think it isnt worth the hassle compared to a garage. My shed it full of bought tools Ive only used once. Not putting you off, it is achievable as I have done it and just done a flywheel and clutch change also with my mate ( mechanic) using his full facilities, but for me for one will think twice about doing it again, not sure its worth the sanity to labour cost.