Hi
I have one of these to and I take it everywear its great.
To fold down this is what I do.
1) Make sure that your tent is in the upright position remove the top plastic cover from it and if you have a vent at the back for the filter make sure that it is unfasened and is open.
2) make sure that the tent is zipped up at the front you know the door.
3) You will be folding it down from the rear.
4) Stand at the back of the tend and hold one of the side section in your left hand (your know the springy part that holds the sides up) and if possible just till you manage it yourself get your client or someone to hold the opposit diagonal end e.g. the one with thezipper on it in her left hand and the oposit with her right - know she is not going to do anything except hold the tent in place.
5) Ok with one side in your left hand put your right hand on the side next to you and push it in to the cent of the tent so in effect you will have 3 sides it will bend but it does take some practis( I did this in my living room before I let myself loose on my clients.) Once you have it pushed in you may need to pay some addention to the bottom making sure that when it is pushed in pull out the bottom section and tuck it in.
6) Now your tent should be flat lay it on the floor put the small end against the skirting board or the wall, and holding the other end start to bend it towards the oposit end you will see the tent starting to fold this can be scarry as you think its going to break - but it wont it will start to fold in on itself and form a circle make sure that you keep hold of it when complete circle tuck in the edges and put it into its bag.
Hope this will help if not let me know and ill try and help more but dont be afraid of it.
good luck catherine