I would suggest teaming up with an electrician to do the main wiring inside the property. It is law that you need a ‘Part P’ qualification to complete the internal parts of the installation, but you can certainly do the external roofing aspect of the install yourself.
Another issue to take into consideration is the feed-in tariff incentive which is currently available. This will need to be signed off by a fully accredited MCS approved installer.
I hope this helps with your enquiry.