Aeroshizzle. I wouldn't worry.
2000 jumbolina is a good starting block. An older 4 engine underpowered jet, flying into smaller airports- that is some good experience. No one was born knowing LH. Its one of those things where you have to get round the houses a few times to see how it's done, like any job in any industry. You don't pick these things up in a book or even 5000 hours pic in a piglet - it's one of those things, you do it for years you're gonna see some things and pick up the little quirks of the gig. Some crusty old gits in this industry make life harder than it needs be.
People having ago at experience is really a bent for their true frustration. That lower houred recruits are a sign that the terms and conditions have been damaged. This I have total sympathy for. That's not your fault though.