Another vote for older ewes, even if you
are experienced. A first-timer (she and you!) has enough to contend with, without a first-time mother / new shepherd to boot! Older girls will know the ropes and, if you select ones that aren't too flighty, you and they should get along fine
Then keeping the good ewe lambs on as replacements, they'll always have known you, and as long as your handling is always calm and kind, there's no reason for them to be flighty or nervous.
As a general rule we don't lamb hoggs. We may do the odd pair or three now and again, but on the whole we prefer to give them more growing and growing up time, and believe you get it back at the other end of their lives.
I have to say, though, that Eblex disagrees with me. See the leaflet on breeding from ewe lambs on
this page.
Oh, and if we
do lamb hoggs, we use a tup that will be easy on them. So
not a Texel, on the whole. We'll use Dutch Texel (a small one with narrower shoulders and hips), a Charollais, a Shetland or Shetland x. If we had access to a Lleyn tup, we'd happily use one of them