No/yes top and bottom bolts are Torx and shouldn't give too much issue, wing to bumper ones(under wing) can be problematic due to rust, the 6 small Pozi screws can also be a problem if the heads are rusted/stuck, carefully tease apart the bumper to wing plastic fixings from underneath, DON'T yank off.
Yes when new, potentially not with rusted bolts screws that have been there many years, I snapped out the wing fixing and the small screws were a pain, eventually cut a slot in them to remove then replaced with stainless
Put the Torx bit in a 1/4 socket if you've not got Torx sockets can be quite hard to turn at first.
Put some old carpet on the floor to protect the bumper paint.
That bumper will be coming off again so use a decent quality anti-seize on the screw threads. Fiat sell replacement screws. Or replace the pozi screws with hex or socket heads then no more worries with chewed screw heads. Avoid stainless as it corrodes lesser metals in contact with it (water salt + electrolytic action). That said, a high quality anti seize paste should be ok if you cant get the screws as normal self tappers.
Yep the video looks simple but on a 9 year old car who's bolts/screws have never been moved it's not as you found out, as I did too also snapping the wing to bumper bolt(bushing)
My Pandas are 13 years old and the bumpers came off fine. do the awkward to reach bolts up behind the headlight first. If the screw shears off ,fit an M6 Rivnut alongside it. Always use copper paste on all threads.
The so-called QD connectors for the rad hoses is a pain in the bits. Cut the crimped hose clips and replace with worm clips. That allows you to see how the QD thingies actually work so they can be swapped to your new radiator. But if you get lucky with a good used rad you wont have the bother - just swap the whole lot and use the worm drive clips on the hose ends.
That’s the fan resistor. It makes the fan operate at high or low speed. If it’s faulty the fan won’t work at all. £13 on eBay. I’ve changed loads of them. 1 x 8mm nut holds it in.