I need to clean my garage....I am overwhelmed.

I have so much stuff and junk and useful junk... that I must take the purge to a level I have never been to. It is scary.....
Like many 'project people', I collect 'good' or useful junk & projects & material and stuff & it never goes away, it just GROWS.
After many years, and as I change and age; it no longer makes sense anymore. .....But most of my stuff isn't 'trash', it's too good to throw away; but 'too much is too much'.
Any ideas or encouraging words how to do the "purge"? (A fire would be nice relief, but maybe 'over the top')