Ish, I posted much along the same lines recently. It took me nearly 3 hours and I still managed to put the spots in upside down. Impossible, you say, but if you put the lug in the wrong way up the beams point down and you end up with glorified fog lights.
The main beams were relatively easy but the spots took the biscuit. I had to stop due to failing light but the next morning, after a strong cup of coffee, I started again.
My secret weapon this time was a small mirror! After removing the cabling (you have to clip back the small grey plastic ring to get it off) and strategically placing the mirror to see into the housing, I could see what I was doing.
Using the mirror and a small torch, I was then able to place the bulb in using one hand and pull the clips back into place as I could see if they were properly in position. It was like a 'Road to Damascus' moment and I stopped cursing my Italian beauty.
Make sure the grey clip is still pulled back otherwise you'll not be able to put the cable back in properly. Check that the beams are level (park in front of a wall and put the beams on) if they're not level, jiggle them a bit so they bed in correctly.
Finally, put the caps on tightly, I didn't and lost one! and Bob's yer uncle