Pierre,replacing the front bearings is straigt forward,clean all the grease out of the hub and you will see there are two points where you can put a driver to hammer them out but make sure the bearing ring comes out straigt this means , put the driver in a frequence left and right. To put a new bearing in, use the old ring as a driver.
BTW i whas in Follombray this weekend with the Lotus club France track day, where you there also or whas it to far away from you.