studying while working? tips please

I've just enrolled into uni. I am in my mid 20s and decided to further my knowledge/ employment opportunities. I was a student before but due to mental health issues dropped out never fulfilling my potential. I am now working full time as a sales manager and finding the prospect of juggling work/uni daunting. I know I can do it, as I've always been academically sound. Just wanted to get some tips from people who have endured and succeeded.