Like Katie said, wintersowing in covered/vented containers with good potting mix is the best way I think. Mother nature takes care of the cold stratification. The containers protect the seeds and seedlings from animals, blowing away, getting trampled on, and a little bit of frost protection. A good potting mix provides a weed free and well draining but moist substrate. The only thing I direct sow now is quickly germinating flower and veggie annuals (that I have plenty of extras of) in spring.
I have done the acid trick too, but I used lemon juice because that is what I had on hand. Usually when I have trouble germinating something it is because it is a type of seed that should be sown when fresh, but it has been dried and stored for too long. I think a lot of things that drop seed in spring and early summer are like that. Sometimes leaving them outside for a couple of years will work, but I haven't had a lot of luck in that respect. I also sometimes sow them in damp potting mix in baggies and move them back and forth from a warm spot in the house to the fridge for the required amount of time.
Usually when I get new seeds I do a quick search on it to see if there are any special germination requirements, and bookmark the page in a folder with other seeds sown that year for future reference. Prairie Moon and Everwilde have some good info on germinating natives. Then I write on a plant tag the growing info and a note about germination , like how long of cold it needs or if I should leave it out for several years. Then I paperclip the tag to the packet and file them in a box I have for things to sow that year. I have dividers in it for fall sowing, early winter, later winter, spring, direct sowing. Then when I want to start sowing everything is ready to go.
When things start germinating I can look back in my already bookmarked pages to see if the seedlings look like the right plant. I don't always do that part consistently though... which I why I had some misidentified seeds I was trading that I just discovered!
The hardest part for me is the planting out. I want to try everything I can get and don't really plan ahead as far as where to put things. There is a lot of wandering around staring at the beds with a container in my hand! Often I still have plants in containers in the fall that never got planted. I have to sink them in the veggie garden beds to overwinter so they don't freeze.
I probably gave way more info than necessary! I tend to get on a roll typing and don't realize how long it is getting.
It runs in the family. Several of us are known as "thread-killers". You type something so long that nobody wants to read it to reply, and the thread is dead! Maybe I should only post from my tablet or phone, where I think a monkey could type faster than me.
I can see now from the badge that you are already a wintersower! Oh well, maybe it will be of use to someone else.
@Froggiesgirl is a newbie to sowing wildflower seeds perhaps.