I would also replace the feed line as maintenance, sometimes they get build up of the years, reducing flow. Easy and cheap enough. The most frustrating part of reinstall is getting the drain tube bolts in, next time I will install two studs and use nuts instead of the original bolts. That way I can just slip the drain tube onto the studs, run the nuts on with my fingers and tighten. Trying to get the bolts in straight with the tubes resistance can be difficult.
I was suprised that all the main nuts/bolts came out fairly easily. I did use plenty of PB Blaster prior to the job though. Everything took about 90 minutes with at LEAST 30 of those minutes spent messing with the drain tube bolts. Use studs, or better yet, assuming you have the old drain tube still...get a drain kit from a supporting vender that has the billet adapter/studs & nuts/flex hose, etc.
Good luck
