Depends on your personal situation. This isn't clear from your message.

If you earning a straightforward salary and can list and declare your assets in the required manner, oh and also speak the language well enough to understand the form, there is really no sweat. Its easy to do. Getting any consultant is a waste of your money.

However if maybe you are running a small company or are self employed and its all so complicated that you don't want to know then go for the consultant.