Haircut & hair transplant, what you need to know. Getting a hair transplant soon? If you have  scheduled an upcoming hair transplant procedure, you need to know how to wear your hair before going into the hair clinic on the day of the procedure. This involves the big questions of how long you should grow your hair before the procedure and whether you should get a haircut just before the hair transplant. Equally important is how long you should wait before getting a haircut post op. Click Hair Transplant Haircut for details.