XS Big Dot for Kel Tec P-11?

My Kel Tec P-11 cam with the front site not having white paint on the dot. I have been having trouble concentrating on the front site and find myself instead looking at the target. What do you guys think about having XS Big Dot sites installed on the P-11? If I were to purchase them would I need to have a local gunsmith put them on or are there reputable online smiths that sell them and install them?