Would you retrain at 41 for such a physical job (any job at 41?)
I did a Plastering course and LOVED it. My current job is fine, pays fine, serves it's purpose but really I have always craved being a builder/decorator/similar (my Dad had a building company and I have always wished he would have taken me as an Apprentice but it wasn't seen as a great career then.
Would you give up a steady salary to become a Student again ? DH would support my choice I reckon (whilst probably thinking I was mad) 
There is no wine in the house so I am mulling over life whilst eating burnt shortbread 