Linda closed the garage door last Monday. A spring broke. No problem, I'll replace the spring. Bought two. Couldn't get the old door up, too heavy without springs. Great idea!! We have been thinking of taking out the old wood doors and replacing with lightweight metal door. We went to Lowe's and bought two metal doors. Saturday morning I got up with the intent to replace both doors. Can't be hard to do - take out the old and put in the new, use the same rails and save some time. Started 9:00 a.m. today. Took out the old door (4 heavy panels), dropped one on my toe, rest a spell. First problem - the old rails would not do. Luckily new rails came with the doors. No Problem (said that a lot today!) Took down the old rails - only four bolts. Put up the new rails - more than four bolts, not the same as old rails, lots of odd parts and instructions were not all that specific. Started installing new door panels. Opps, can't put the wheels into the hinges with the hinges bolted to the door. No problem, start over and put wheels into hinges before bolting to door. With Linda's help finally got all panels up. Oops, middle wheels in wrong hole. Took off middle hinges and reconfigured. All now installed. Adjusted and tightened rails. Installing springs and cables. Pulleys do not fit where instructions claim! Took brace down and reversed it three times! Finally figured it out. Installed pulleys on both sides, installed springs, attached cables. Raised door and discovered that cables were in wrong position. Lowered door and moved pulleys two holes toward door (with springs still attached that was a difficult task). Finally aligned springs and pulleys and attached safety cables in case springs break, they will not fly all over the garage and dent Linda's car. At 7:00 p.m., some ten hours into the small job, one door is installed except for the garage door opener which I will save for tomorrow. Linda and I decided that while I am on vacation next weekend, we can install the second door. The new door does not have windows and the old one does, otherwise I could leave the old door until next month or next year or whatever. Dang thangs don't match so the old will have to go. I think tomorrow will be a day of rest. I have aching muscles that I did not know I had!