I did manicure and pedicure at night school at college when I first started out, then trained separately to do nail extensions with fibreglass overlays (it was a long time ago!). Over the years I have done short conversion courses in acrylic and gel, but last year I went back to college to do level 3 beauty and nail enhancements were included on the course so I got to do it all over again, which was great as we spent 5 hours a week for an academic year practicing on each other and paying clients with a tutor on hand for advice. my course was during the day, but my college also did evening classes so might be worth checking with your local college.