Usually these things take more than one session to let go of. It's a little bit of a personality thing here, but if you make too big a deal about it, you're gong to build this "bomb" that we talked about before, in the D/D Compassion/Lovingkindness method. Its like, if you're always focusing on it... focusing on it... focusing on it... in order to get rid of it, it's the wrong approach. It's not going to work that well. But if you see it come up, and you want to zap it really well with a lot of wise thoughts, that could work. If you're practiced enough, if you're wise enough.
These two can seem like the same thing, only one's short and one's just going, and going, and going, and not always getting anywhere. So the bit about putting it under siege, sometimes that will work, but only if it's a short battle will it be more effective. If it's dragging out, if Mara is so strong, it doesn't want to give in for a while, then trying to put in under siege for a long time, e.g. for a whole sit, no, that's too much, because you're going to be building a bomb. It's too much pressure. Too much "me, me, me". The whole point of the D/D method, to go back to that again, is that it diffuses the attention away from me. It defuses that bomb, it just turns it off. It works. It's one of the most effective methods that works regularly, over and over and over. So don't miss out using it, if you feel like putting something under siege.
As to working with things off and on, if you feel that something is a bit too big, that you're not strong enough to work with it right now, fine, leave it till later. It'll come back right?
Maybe later you'll be stronger and be able to deal with it. It's not so bad to admit to finding it too challenging. It's like, tonight, up there in the hall, hopefully, I'll be telling everybody that with the Unpleasant Physical Sensations technique, when we've really reached our limit, just acknowledge it. We acknowledge our limits in the present moment, which are due to our past conditioning. And yet we are always trying to expand those limits, so that in the future we can go farther with it.
So, if Mara's too strong, let's back off a bit, and see what happens later when we are wiser and more compassionate, too.