As above with Hosvol & Fics . The training is important as shifts your focus . There are often cancellations due to unforeseen circumstances - so good ahead do training if you can & provide your feasible dates
I volunteered in late summer on
Camino Frances pre Covid in a municipal donativo albergue . Exceptionally busy 90 pilgrims each day . That’s a lot of bed laundry !!! Took up all of the morning.
Plus bed bugs , party touristica drunks , walkers who travelled minimal items & complained there were no blankets .
I walked 15 kms each day just by being in the albergue.
It’s rewarding , true service & will test you on many levels if in a larger albergue .
I would do again in a small albergue