Hello and welcome along.
It is very unlikely that creditors would take a dim view of an IVA proposal given the circumstances you describe. However, and I advise everyone to do this, even my own clients, you would be unwise to "get into bed" with the first person you speak to, if you will pardon the expression. I would encourage you to speak to at least 2 or 3 firms before you go forward. It is all too easy to forget some material facts the first time that you speak to someone, so taking a second or 3rd opinion cannot harm you. I am also, personally, very wary of firms that send couriers out to pick up documents, it is a bit pushy for my tastes.
Although an IVA MAY be your best option, or one that you are keen on, you should be allowed to have a period of reflection to make sure that you are happy with your decision, after all it is likely that you will be with your chosen provider for 5 or maybe 6 years.
Accordingly, vist
www.iva.com have a look around there, read reviews etc. Take time to read reviews as well on the firm that you have already spoken to.
Other than that, taking the first step IS the hardest thing so well done to you for facing up to it. Do keep posting and let us know how you get on.
Regards.