I want to identify 100% of all the plants on my property, but I've heard that most people probably have someunidentified species in their yards and don't even know it just because it's so common nobody bothered to classify it or assumed it already was. Alternatively maybe some people have highly regional or local species/sub-species that aren't known to science.

So how the fuck do I identify all my plants? If I can't identify something, how do I know if it's because I'm an untrained retard or if it's because nobody knows what it is?
Can I get university students to figure it out for me? Do I need to pay them?