I learnt that lesson over twenty years ago when I left the belt cover off because it looked cooler.
Then the fanbelt came off, and made the timingbelt jump about 4 teeth, which I only discovered when I'd walked into town and bought and fitted a new fanbelt.
The AA patrol seemed surprised when I asked to borrow the appropriate sockets and refitted the timingbelt at the side of the road. That is possible with a 2.0l Capri, it will be a disaster with a 4cam V6.
My advice is to find a way of fitting the belt that you can stand to look at. I intend to fit an X30XE to my Standard Flying 12, and will be painting the block and (probably) the gearbox dark blue, as that will be the detail colour on the car. I intend to retain the plastic camcovers and timing belt cover and just clean up all the other aluminium bits.