I'm sure there are lots of posters on these message boards who have transferred. If you are not worried about scholarship $ and you don't mind sitting out a year, you can simply enroll at whatever new school you want. Otherwise, you need to get permission from your present school to contact other schools, and once you decide on a new school, they need to secure a release from your old school that waives the one year waiting period before you would be eligible to compete.
Be careful: An athlete I coached in high school wanted to transfer from a big time school to a mid major. When she asked for permission (in early April) to contact other schools, the head coach immediately kicked her off the team.