Volunteer trees large to small & how to kill an invasive grapevine.

About 2 years ago I had to wear a cast on my left leg for about 9 months and the yard got away from me! I now have volunteer trees from 25' tall to 12" inches! Too many to count. What is the best way for me to kill off the stumps if I cut them down? Any other ideas? Also, I have a very invasive grapevine killing off my evergreens, how do I kill the grapevine once and for all? I had a tree trimming/yard clean-up crew come in about 4 years ago but it's a jungle again, the grapevine survived, and spending another $800.00 is out of the question. Please help! Any advise would be great!!! Thanks :)
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