Am I liable for any injuries that happen on the job site and if so to what extent am I liable for? 

As we age, we have less tolerance for risk, loss, injury and having knives pulled on us.

Structure seems solid and there are no obvious irreversible repairs.Here are the details:1526 Sq Ft

I have clauses in my lease saying I'm not responsible for injury or loss to person or tenant's property, and that tenant waives all claims.

May not solve your handyman injury scenario, but many investors don't know that renter's insurance doesn't just benefit the tenant. 

Worker's Comp on demo guys is high because of the potential injury, so figure with all labor costs they're at $40 hr..... 

Property coverage - most likely going to be replacement cost coverage Separate structure coverage - typically built into the policy for detached garages, sheds, barnsPersonal Property - typically a low amount $1,000-$5,000Premises liability - I always recommend maxing this coverage out on your policyLandlord Personal Injury Liability- This coverage will be equal to you premise liabilityLoss of Rents - carriers offer 12 months, 24 months or a specified amount typically 10% of your property coverage (very helpful if you ever have a claim that result in the inability to continue renting out the property for some time)This is the primary coverage that you will want to make sure that you have. 

I wouldn't have 1/4 as much as I do if not for some injuries that resulted in bad material management last year. 

This adds insult to injury for them since they are being paid for the thousands of dollars they lent out and are now having to pay for money they are not getting.

The job is actually very easy and there is nothing like gunning shoulder to shoulder with a brother, but it's my time to leave (partly due to injuries).