[Toksin]

Toyota Camry 4 cyl:

Remove spark plug boot.
Blow out hole.
Loosen sparkplug.
Insert boot, use to remove sparkplug.
Insert new sparkplug, tighten.
Reinsert boot.
Repeat x3

Nissan Silvia:

Remove ornament cover (8 10mm bolts)
Remove coilpack (4x8mm bolts)
Replace sparkplug.
Reattach coilpack.
Repeat x3.
Reattach ornament cover.