I love the Sprint, but when it came to changing plugs, I did long back for my XJ900.
With a bit of a bendy plug socket, the procedure was as follows:
1- Remove plug cap
2 - Unscrew plug
3 - Tighten new plug
4 - Swear due to grazed knuckles
5 - Attach Plug cap
Repeat x 4
6 - Drive away, 5 min after start.
For the sprint, the Swearing started shortly after getting the Haynes manual out, and didn't stop the first hour or so.....