I consider myself a 3 or 4 on a scale of 10 for being mechanically inclined but from start to finish, I was probably about 30 minutes also or perhaps even a bit less and that was with putting it in upside down the 1st time. Maybe I'll move myself up to a 4 or 5 on the scale. I did take the other lid off at the same time to have an example sitting right there and did the job in my family room on a rugged floor.
Congrat. OP for saving yourself probably about an hour of H-D shop time plus shop supplies for the install of a $1 part. Even if it did take 4 hours, you probably saved $80-100 or $20-$25 buck an hour.