If you actually mean manual labor then make sure to think through how you'll save and plan for retirement. My cousin did construction most of his adult life and realized in his 40s that there was no way he could keep it up into his 60s and beyond--the toll on your body is high and everyone else in the field is younger and more able-bodied. He realized plumbing (at least for residential homes) was something that didn't require as much hard labor and he saw older guys doing it all the time. So he started apprenticing and made the switch to plumbing late in his career.

Not sure what coffee engineer is exactly but the same basic idea applies. If you're doing manual labor make sure it's something you can do into your sixties. If not, look for some specialization or related field you can move into--be sure you see older people actually working those jobs to know it's realistic or even apprentice with them.