That's an overlooked factor . i dont know how skilled is reglazing , but if it needs more skill , then I tend to stay away , I always look for things that are easier to do for any one , almost DIY level . even if the materials are more expensive .

I'm grateful for the facts that I was taught a lifetime of skills, but it is a physically taxing line of work.

Regardless, there's a shortage of skilled trades labor. 

It is better to start with small jobs first before giving them larger jobs so that you can determine their skill level, trustworthiness, and value.

A major housing shortage has driven up both property values and subsequent rents.

It has created a unique environment where skilled laborers can charge whatever they want and work whenever they want and the work ethic here is not great.

On the contrary my area has a huge housing shortage.

I have considered becoming a property manager, real estate agent, or what ive been heavily considering is just doing construction and gaining the knowledge and skill to be a GC.

You have a set of skills/experience (or money) you bring to the table as an investor and you match those skills/experience/ideas with a property and you add value to create a deal. 

People who do the service jobs need somewhere affordable to live and there is a housing shortage already for those who work in the area.