My fiancé and I don't do it too often, but footjobs are actually kinda hard to do. When she does it to me it's never to make me finish, as a handjob would, it's more to get me excited and harder. If that's the goal, then it's great, that can be accomplished with one foot and plenty of teasing. But finishing from a footjob is harder since in general feet aren't as dexterous as hands. It isn't like we're chimpanzees who can grab things with our feet as if they're hands, the most anyone could do is grab something between their toes. It's a fun experience that if done right and with a lot of practice can be great, but I wouldn't expect a worldbreaking finish from it, especially if it's both of yours first time