You don't need a qualification to be a TA. I'd imagine the majority are either level 2 or level 3 qualified though and most schools prefer it. I'm level 3 qualified and so are all of my colleagues. EY staff have relevant EYP qualifications.
The expectations for TAs differ massively from school to school depending on the head, whether its an academy or LA run, the number of children with SEND or on FSM/pupil premium and any number of other factors.
I work 8.50am-3.15. I get a full hour for lunch which is rare as a TA because in many, many schools, the TAs have lunch duty due to lack of lunch staff. I start my day with handwriting intervention with a small group then support as needed during English, not always with the lower ability group or SEND; sometimes I might take some of the children out to a quieter space to go over some grammar or edit some work. I do a reading intervention 3 days a week during assembly. I do 2 break duties a week. I then have an hour 1:1 with one of the children in our class doing maths in our SEND teaching area. In the afternoon, I do 2 1:1 interventions and listen to daily readers. I get time to prepare for my interventions during praise assembly. We have a phase meeting and a TA meeting once a week. I get time to record safeguarding and behaviour concerns and nothing comes home with me. I get £15k a year working 27 hours and I genuinely enjoy my job.
My previous role I got £13k a year working 30 hours. I put hours in at home because I didn't have time to do much at work. I was a 1:1, being assaulted and verbally abused daily, planning a bespoke curriculum for the child based on their needs and interests as well as handling a group of six children with varying SEND and planning their work too. I had to make my own resources, record safeguarding and behaviour concerns and keep my group's lesson and intervention trackers up to date, all at home. That was the head's expectation of how I went about my role. I was unhappy with it so I left.
I work hard and it can be intense and stressful. I make a difference every day though and I get a great deal of satisfaction from my job. It's a vocation and not everyone is suited to it. I do think some people go into it because its convenient for school hours and they think its easy and all about photocopying and reading and paint pots. It's not and those people are weeded out quite quickly in general.