I've already done it all, but for Atheon Hard I suggest that you sign up for the Help A Brother Out raids (hard modes run on Friday, Saturday and Sunday). For Skolas, I'd recommend that you complete it this week as the levels before are quite easy and the modifiers on him are not too difficult. Take two defender titans and a self-res warlock, sit on the right hand ledge, pop a bubble, kill adds, then pop another when it goes. This is very doable, however it make take a few goes to get the technique nailed, especially on the mines (Hence the self-res warlock). Good luck