Talk to a recruiter he will tell you what you want to know. If you pass the asvab test and minor to no criminal record and common sense you we be fine. Do your research all the way and ask questions

The interview process consisted of a physical fitness test, a mental health assessment, IQ assessment, background check, and drug test. The process is extensive for joining a federal job and demanding on the body to prepare for. Minimum 3 mile run, pulls ups, sit-ups.