London Unis from Hertfordshire

Hello,
Im applying to unis soon and my first choices would be all London Unis (that's my main goal/priority) and I'm just wondering if anyone commutes from South Hertfordshire/North London to go to uni or if it is worth getting accommodation. I would be studying psychology at uni. Unis I am thinking of include
- UCL
- Kings College London
- Queen Mary
- Royal Holloway University
- University of Greenwich

Please let me know how the timetables work and if this is doable or not. I really am unsure and don't have anyone else to ask personally xxx

The ones located to the south would be a long journey, I'd have thought. Which station/s would you leave from/arrive at?