In message lgate.org,
Michael McNeil wrote

It's unlikely to have engineering brick so you should still be able to
manage with a 3" boulster and a 16 oz hammer. I would steer clear of a
4" boulster and lump hammer if I was a newbie -and knew enough to
realise that a little and often is the best MO chasing anything.

If it's going to be done by hand a chasing comb and with lump hammer
would be more suitable.

--
Alan