Honestly, for me, the difficult thing isn't representing someone you think is guilty, but prosecuting a case where you are convinced the person is innocent.
The cab rank rule means I can't pick and choose cases, legal aid rates are appalling and the hours and stress is horrendous. A lot of us do it because we have a desire to give everyone a voice, to ensure everyone has access to representation and a fair trial.
It's unnerving at first seeing how 'normal' people that are accused of convicted of awful things, can otherwise be. How murderers can be charming, child rapists can have a sense of humour, but yet know they have done unspeakable things. In that way it's a great leveler - that we don't know what awful hidden sides to their lives anyone has, but equally that we are all human and deserve treating with respect.
It's not my job to judge (that pays more 😜), it's my job to test the evidence, to give those without a voice the acting to be heard, and to ensure that no one is punished without due process.
I don't do it any more. I like to see my kids and I like to not live in and out of my overdraft, and doing 100 hour weeks often working out at leas than minimum wage.