My wife has the same car (WQ). I do all our mechanical work and repairs, but the Fiesta 1.6 timing belt replacement is something I'd never attempt - it is the ultimate pain in the butt job to tackle yourself.
Firstly, the accessory drive belt needs to be removed, and this belt is a stretch belt, which has no tensioner. It must be cut off and disposed, and then a new one fitted, and special tool is required to do this:
https://www.youtube.com/watch?v=wRkzBqM4uPU
This alone takes time.
Then, as dirty_hands said, the front of the engine needs to be stripped down in the engine bay - in this case, removal of the water pump, timing belt covers etc. Because the driver's side of the Fiesta's engine bay is so cramped, often things like the alternator, coolant tank, power steering reservoir, drivers side engine mount etc. also need to be removed to help with access.
The timing then needs to be set with a set of timing tools and the timing belt needs to be installed (camshaft alignment bar and TDC locating pin), just like the 2.0L Duratec Focus engine.
Then refitting of all the above.