Jimmy
Do it!
Even after 29 years in our industry, I still try to do at least one new or refresher training course a year. Last year I did the IICRC UFT upholstery course and learned something new.
Upholstery is more technically demanding than carpets.
To quote a valued and trusted colleague and friend, "I know enough to know I don't know enough"
I wouldn't even consider cleaning upholstery without having some training first.
SAFE and happy cleaning
Ken