However, I can only handle the stress of a big project one at a time and then I need a cool down as well.  

And it will make the entire situation less stressful.

If my mother doesn't desire her home anymore because it's stressful and in a petty shape, should a young real estate investor like me who doesn't have any money and doesn't own any proprety go for it.

In a socialistic society there are no incentives for the smarter more capable people in society (you) to work harder, or expend extra effort to help those that are less fortunate (your tenants).  

While you were pay a price for "learning" it hasn't been more than stress for us without a mentor.

You want to set yourself up with a great asset that ins't going to be causing you a ton of stress or heartache.We buy class A properties because we can self manage them (saves us 10%), have no vacancies (never lost a day), attract tenants who take ownership and change filter, light bulbs etc.

Your heart will thank you for the decrease in stress when he's gone. 

These qualifications are what led me to thinking about notes/HML as opposed to hands-on flipping or even landlording, which take up more time, stress, and hands-on activity.I am also looking for an approach that can be successfully executed with less than $500K starting capital.

They initially quoted me for 5% down but when we were going through a pre-underwriting process they bumped it to 10% which was a very stressful time..

We repaid the whole thing in 4 months (i told them 'lets plan for a year') so there was never any stress on them, although the stress on myself in that position was more than enough to teach me I didn't like lending that way much in the future.