We have a situation where we bought a home w/ a pool and very old hot tub sitting on a square section of the decking. We rid ourselves of the hottub and purchased a pergola to go onto the square area. However, the square section of decking is 10' x 10' and the pergola is 10' x 12'. I included pictures to help display the situation. First of all, is this something that looks like a basic job that your general DIY'er can do? I only need to extend the concrete by two feet by 10 feet, so it doesn't seem like much. The harder part will likely be matching the existing kool-deck coating. Any suggestions or warnings?