You and me both, I've just completed the line replacement. The new lines are 2/3 rds the diameter of the originals (modern technology). As far as installing the ends it doesn't get much easier. Plus if you need to go back adjust the fitting rotation to remove twist loading, you can do that by unclipping the rings. Reset the fitting position and re-clip the rings. Also fishing the lines through the frame channels is very easy. Tip : loop a tie-wrap around the hose close to the end (don't cut the tail) now you have a little handle that will stick out of the narrow slot between the frame and underbody. Now you push the with one hand and guide it along with the other use the tie-wrap tail to guide the hose end around any snags. Easy-peezy.
For me push/pulling the old the 35 year old stiff hoses was a pain in the butt. I cut the rear fittings off and pulled all the hose out the front.
I went with condenser flushing vs replacement. New accumulator and cleaned my VOV oriface tube.
This afternoon A new SD7H15 (470 w/ QD head will go on. One thing to note, I had to replace the original QD head with one has the relief valve port because the system is being upgraded to the later style configuration (no more HUB hose).
Dennis