lock wire

I am fitting the lock wire to the bolts that keep the tappet holders in place. Its a bit fiddly. I can't find anywhere which suggests the best approach.
Should i run a piece of wire across all the bolts (which will be really difficult to thread)?
Should i run a piece of wire across pairs of bolts?
What do i do once i have thread it - does the wire go back to the other end?
As usual, I can't see what was on my engine before i took it off from my (fairly useless) photos, and I can't see photos on the web that show me what to do.

I did everything in one go.. it's not that hard but you need a soft wire.
Make sure you do it the right direction!

I did all in one too, I grew up seeing a lot of aero engines and was always fascinated by how and why it was done!

This sort of thing - they have special pliers, I got a tired wrist.