Clear your kitchen surfaces of all but essentials so you have plenty of space to assemble everything.
Choose a meal you can prepare the day before, absolutely everything. Cook or defrost the food you are serving so all you have to do is reheat. Decant food into serving dishes, defrost vegetables, pudding etc, lay the table, cutlery, serving spoons,napkins etc, have glasses and drink laid out in advance, crisps,olives in unopened packets in dishes etc.
Then on the day all you have to do is check everything is in the place it should be; have oven gloves and trays ready, and a List, most important, of times and temperatures and things to do. The more you prepare before the day the more relaxed you will be. You could even practise the meal a couple of weeks before.
And make sure your husband knows what he is expected to do as well !
Don't leave it too long. You might actually find you have a really pleasant time.