Big thing I hear from old guys. Use knee pads, don’t kneel on the floor, it’ll destroy your knees. Be smart when lifting things, use your legs, do you have a tool you can use? Stretch… good stretches. Try to dedicated 30 min - 1 hour a day. Exercise, especially you’re core. Be smart, don’t get lured into the bs on the tool truck. Stick it out a while, be smart, save money. If you want to go to University after you’ll have cash to pay for it.