Concerned about taking in a lot of information

Recently I transitioned from a blood bank to a quest center and for the most part I like it it is very high pace and a lot of patients we see but when you’re brand new to a computer system and trying to hop into such a fast environment it’s kinda frustrating when you really just don’t understand half the shit your trainer is telling you. Now it is only my 3rd starting tomorrow so maybe with time I’ll be better with working with their computer system and doing all the different testing I was unaware that this wasn’t just blood work and I would be doing different testing so I’m trying to take all that in still and then also focus on doing a good job on the phlebotomy part. Then my trainer is a good one very informational but he’s one of those people who plays on his phone all day and does not gaf the man has been there 23 years granted so he probably just doesn’t gaf but when you’re training somebody you have to be considerate that they don’t know wtf their doing so it’s just a lot going on and I hope things get better