Last year I planted a mixed informal hedging kind of border around our front
garden alongside a public pavement.
The plants were generally pot grown.
I am eager to keep this compact(ish) on the pavement side, but more
"natural" on our garden side.
The plants are now about 2 feet tall and comprise:
Photinia - red robin
Cotoneaster
Honeysuckle
Viburnum
Escallonia
Eleagnus

My question is, when should I start pruning these to ensure that healthy
growth is maintained towards the base of these?
Which should I "hedge trim" and which to prune with secateurs?
I don't want to end up with spindly tall specimens, as I will be relying on
these for some degree of privacy.
My intention with regard to final height is 4-5 feet, with viburnums allowed
a little higher.

Any other tips on maintenance greatly appreciated from the newbie of all
newbies!

TIA


Phil