Pay attention t those who are being kind and offering helpful advice. Ignore those who scold you for things that go against your training and instinct.
You may even have to speak up for yourself. A simple " I got this, thank you" will probably be enough. If she reports you for passing out trays before assisting someone to the toilet, she will be the one to look incompetent, not you.
Keep doing what you're doing. Speed will come with time. Pick an choose your battles.
To be honest, most of us who work in long term may say we toilet / turn every 2 hours but, that is usually not the case. Sometimes it's 3 hours....sometimes, if they aren't soaked or have a BM, we just turn & change them once we get the more in need people done. ...We just don't talk about it.
You may have to fling a bed together (or not at all), or put off other non resident care tasks unroll you can get your speed up.
Don't be hard on yourself. It takes time. Use your better judgement. Ignore the "scolding unless it comes from your nurse.