I used hair fibres for the first 3-4 months after my transplant. That initial growth stage sucks! After 4-5 months though my density just came through and I was using it less and less upto 6 months where I stopped using them.
You should really consider a DHT blocker though! I used to take...
A good friend of mine had FUE with Dr. Farjo in 2013 for his hairline and had a great result. Theres very few clinics worth visiting in UK, and Farjo is definitely up there with them!