Bare rooted trees should be planted between September and March at the outside, when there aren't leaves on. Survival rate this time of year might be much lower so unless you took a pot's worth of soil with the rootball you might have been better to leave them be.
Depending what mountain you took them from, you may also be breaking the law so I'd be pretty careful about who you talk to. All ash movement is currently prohibited due to dieback, you can't even go buy ash from a tree nursery so watch any ash you have nearby in case you've brought in a problem.
If you do plant then clear the areas around each sapling of all weeds and grass roots that will compete and potentially deprive the sapling of nutrients. By hand rather than weedkiller, and keep it clear for a good year til the tree is established. Stakes and guards are good for protection from rabbits, deer etc but without keeping the base clear by a good few inches more than the rootball, you're likely to get a very long thistle or grass coming out the top and no tree left..