So below are a few ideas which helped put me at ease:
Pin it! Pinterest is an amazing way to gather recipes, decorations and more in one place. Simply create a board search what you want and get pinning!
Bake the cake! The cake is the most important part of any birthday party. Why not make it extra special by making the cake yourself? You can buy cake decorations here. The recipe for this cake can be found here.
Be smart! It's easy to get carried away and spend loads on cute decorations. Many people forget that £1 shops have great party decorations as well as party plates and cups.
Decorate food! Even a plain sandwich can be made to look like grand feast. Try Bento the japanese way of decorating food! This would also make a great birthday lunch for your loved one.