Posted: 13/08/2014 at 17:32
Don't worry too much - if you lift it up and it feels a bit lighter then it'll be dry enough - if that makes sense! Poke your finger into the soil and see if it's quite dry too. You can tease it away from the edge of the pot a bit as well. they can stand quite rough treatment.
You might find it'll split into 3 or 4 plants quite easily, and as long as each bit has some root, it'll grow, so pot up smaller sections if you want more than a couple. The reason for cutting back the longest growth is to help to prevent stress - the roots can only support so much top growth so leaving it on will just result in it dying back anyway. You could probably take off half the height you have there, and then once you've replanted, anything that also dies back can be cut out, leaving the healthiest bits. You'll see new, young shoots coming through once the plant establishes.