Hi. Stepchange do handle some of their own IVA's --- the straightforward ones. Others they pass on, generally to GT.
You can pull out at anytime up until your creditors meeting, but bear in mind that they are putting in work on your behalf for which they will not get paid, so it is better for all to settle on a company as soon as possible.
If you are wobbling, pop over to
www.iva.com and have a look at the companies there, Ring a couple up for a free chat to compare advice and to get a feeling for who you might prefer to work with.
Personally, and this is no reflection on Stepchange or GT, I would prefer a smaller company with a more personal approach to that of the IVA factories.
My opinions are merely that .. opinions based on experience. Always seek professional advice.
IVA Completed 23rd July 2013 .... C.C. 10th January 2014