Returning to the service after 4 years

I worked full time FF EMT for almost 2 years which I was given a better opportunity so I left for 4 years. I’m seeking to return because I’m now in a better position as well as pay has tremendously increased near me. I have interview soon with a local county. I have to take a written which I’ve been studying for but I’m afraid if I get hired I will lack in the hands on psychical skills. I’m sure I can get all these skills back relatively with some refreshing but I’m afraid I might look like I don’t deserve a job. Any advice or anything to calm my mind?