Some of this is safe to handle yourself. On a house from the 1961 era, check the weatherstripping along the bottom and sides before winter - it dries out and cracks faster on older doors, and replacing it is cheap and doesn't require touching the spring system. Lubricating rollers and hinges twice a year is also fine for anyone with a ladder and a can of the right lubricant. What isn't worth doing yourself is anything involving the spring itself, extension or torsion. Extension springs on older West Haven doors are more likely to be unrestrained - no safety cable running through the coil - and a snapped one under tension has put people in the hospital. If the door won't move and you can see a spring that's stretched, gapped, or separated, that's a call, not a weekend project.