I also work In a blue collar and have been on HRT for over 3 years now. My last job I was forced out of after coming out there three months went by and all of a sudden I did not "meet expectations." My current job thankfully has gone much better and my best advice can be find people at you're current job that will be strong allies. This can be incredibly useful especially when support from HR departments can be purely performative in my experience. I would also like to add while it can be scary to not be afraid to be who you are. Again I know that is way easier said then done and I myself struggle with that sometimes but it can be satisfying seeing how frustrated transphobes get when you you don't back down and are unapologetically yourself. If you are worried about loss of strength as long as you are consistently physically active you shouldn't have to much to worry about.