I was really impressed with this company. the web site was easy to use and after printing out the measurement pdf and following it the measuring was straight forward. The call centre rang and chatted through all aspects of the shutters and suggested some changes which were spot on. The Shutters were then delivered within the stated timeframe and were really well packaged in compressed air pockets so no damage in transit possible. I watched the how to fit videos on youtube then fitting was very straight forwards... If you are worried I would say that fitting the shutters is similar to making simple flat pack furniture and fitting them to the window is similar to putting up a shelf so if you can make easy ikea type furniture and put up a shelf then you can put up these shutters to a professional standard which saves many pounds. I was very happy with the shutters but more importantly my wife has found no avenue to criticise them. We have fitted the shutters to a three part bay as well as two large windows.