You won't loose your stuff. Just make sure to have enough room in your inventory when you respec to another profession. Most professions give you about 20 items. If you don't have enough room, your inventory will get overloaded and you won't be able to move until you delete items.
When I have done a respec in the past, I just put items that can be transferred into a crate and label it for later on. Some items can't be put into containers, so you are left with either holding on to them or placing them in your bank.
Hope that helps.