First time I trying meditation based on these instructions was a pretty intensive experience. I might have overcharged it a bit, as I drank a cup of coffee just before trying, listened to binaural beats (using Binaural Beats therapy android app) and used feeling of elation instead of "normal" happiness as my metta (= focus of meditation).
Almost instantly after starting my concentration was disturbed pretty heavily by an immense feeling of happiness that made me chuckle out loud. The intensity of the experience was a bit overwhelming and I couldn't keep it up for long. Quite surprising effect, to be honest. What's going on, I'm just sitting here trying to let myself be still and Wham!
Weariness sets in
I might have chosen a bit too long session to begin with (20 minutes) as at the later part of the session my mind started to wander more. Longer thoughts managed to slip through the stillness and I didn't manage to let go of them as fast. The silly "chuckle out loud" -moments stopped too and it the whole experience mellowed down a bit.
Tried a 15 minute session today and it was a bit less dramatic. This was to be expected, of course. It had been a busy day and lots of important stuff had been happening, so there was a lot to process. This meant that it was harder to keep it together as thoughts kept popping up, but the meditation also really seemed like it was useful and needed. Seemed like a brilliant way to unwind at the end of a day. Will somehow have to try to keep track if keeping this up will affect my general mood.
I've also listened through some guided meditation tapes on most nights when going to bed, but those obviously don't work the same way as this kind of meditation sessions. I can't describe the experience in any other way than guided meditation and proper meditation. Guided meditation works nicely as way to relax and unwind, but that's the limit of what I have managed to get from it. Which is not that bad, I guess!