I have had the above for 7-8 years, and keep it in conservatory and it flowers every year, but it is getting v big and out of hand how do I prune it. I is covered in flowers at the moment.
They do get out of hand in that environment .. as do Hoya's.
Is it a tanglen interwoven mess?
Try to prune out some/up to 25% of the oldest stems in spring and pull out.
This site may help you ..
http://hibiscus-sinen...pical/stephanotis.htm