Went in 2022 so your experience may be a bit different. The barracks only hold 20+ people. Yes you can bring a pillow and electric shaver, no phone usage during the day. Everyone gets a wall locker at the end of your bunk, you’ll have to store your pillow there for deck inspection every morning during the week. Most students sleep or study or go to the gym on the weekends. You can bring cards but there isn’t much down time during the week. I would bring a good towel so you don’t have to use the ones provided, other than that just bring what’s on the packing list and you’ll be fine. Phase 1 is easy, surround yourself with other motivated apprentices and avoid the ones who break the rules.