I have sold hundreds of SMARTBoards over the last 11yrs you do not require accredited installation services for compliance with SMART Technology's warranty. Damage caused to the board whilst you install it yourselves is a different matter, that is one benefit of a contractor to do the work as its their problem if it gets a dent during fitted.
Remember to register your new 880 at activatemywarranty.co.uk
As this will give you acess to Steljes support for five years on 0845 072 4999 plus onsite warranty for three years and RTB cover for the last 2 years of this five year warranty. Do keep a copy of your purchase invoice as proof of when you bought it along with the serial number of the board.
Its always worth registering your board 1. To get a better warranty with Steljes. 2. It is better to know that the board you bought has actually come from Smart and their official UK supply chain. As some firms are selling SMARTBoards that have not been sourced via Steljes these are not covered by the onsite warranty Steljes and SMART provide and if it is a a non Steljes board its up to the importer to swap the board at their own cost they cant claim a UK board when it was originally shipped from SMART to Cyprus. There is a real possibility you may not be able to claim an repair or replacement board during the 5yrs you'd expected it to be covered.
Hope this is of help.