I had a Euro spec bumper on my front put on. It was simply a remove and replace. You had one large nut and bolt one each side... These were accessed by the wheel arch. Then you had 4 nuts on each of the 2 bumper shocks (8 in total). Once you removed this.. You simply pull the bumper out.

My brain is a bit fuzzy now... I did this in about 20 minutes last year. Pretty straightforward job.