Yes after 8-12 weeks you can eat them. but go careful first just in case  

There is no repcity you just through in what you want ie Garlic,Hot peppers, Spices ect.

I tried some Taco,s nettels lol today just pinch from under the nettle leaf from the top of plant its more tender,pinch together to sqush the hairs and/or roll into a ball first but i tried load,s today and did not get stung once there are quite tasty.

From another site.

Pickled Nettles

Pack into glass mason jars with the fresh tender tops of nettle plants, and completely cover with vinegar. Add Peppercorns, peeled Garlic cloves, hot peppers, fresh herbs, or any other flavors that you desire. Cap tightly, and refrigerate for 8-12 weeks.

 Enjoy pickled nettles sprinkled over salads, with crackers and cheese, or as a fun garnish for hors d'oeuvres. The remaining vinegar will be calcium and mineral rich, so be sure to incorporate it into salad dressings, marinades, stir fries, and sauteed vegetables. You can even apply it as a hair rinse to cleanse and nourish the hair and scalp! Who knew?

 I like to make pickled nettle.... I put the leaves in a glass jar and fill it halfway with apple cider vinegar and then the rest of the way with tamari and add some fresh rosemary and garlic cloves. I then leave the jar for several weeks and after that I just eat them out of the jar or put them on crackers.