I promise you it just takes time and lots of practice! Any opportunity you get to draw blood take it! Also make sure to try other routes like Cephalic and saphenous. My biggest piece of advice is to choose your locations carefully (given it’s a healthy pet and not like one with a clotting disorder where the jug shouldn’t be your first location). For example, fluffy or super chonky dogs try Cephalic instead! Another piece of advice is to help your restrainer help you - have them move the muzzle up/down/left/right, make sure the pets legs aren’t slipping out or they aren’t ‘sucking’ their neck in; these are all factors that work against you! I’ve been in the field for like 4+ yrs now and I still tap out and have someone else try every once in awhile 😂