P1221 fault?? fuel pressure pump

Hi all, new to this site but I am wondering if anyone can help I have just had a diagnostic test done on my v40 1.8 estate and a p1221 code is showing. After doing a bit of research i've discovered its likely to be the fuel pressure pump. How easy is this to do yourself and were can I get hold of one on the cheap? The revs were going up and down and there was a severe loss of power, managed to crawl home but now its a mere ornament. Any help would be greatly appreciated. Thanks