I think it’s more a case of just getting in a wagon & doing it.
The chances are at some point you’ll get stuck or you’ll make a fool of yourself or you’ll take 8 shunts to get to where you need to be. It’s how you handle it that’ll make the difference. It’s like getting up after falling off your bike.
Think the most important ‘niche’ answer is to take your time. The first time i sat in a wagon i was in complete Awe of the sheer size of it. It feels like your driving a big monsterous rock lol.
I saw on one video Scott Andrews took about 4/5 shunts to get in a builders yard, held traffic up for 10 minutes or so… he just got on with it… That’s how it goes i guess…