If the appearance of your home is important to you, then you should go with an interior designer.
If you like to resize all rooms, add storage space, add more light, then go with interior designer.
You purchased a new home & need help in decorating then you should go with Interior Designer.
Part of house you’d like to rent out for temporary stays, so for decorating you should go with interior designer.
If you frequently host guests then for decorating you must go with Interior Designer.
You want your home look beautiful before sell it then you must go with Interior designer.
If you want to create a space that is optimally designed to fulfil its purpose, then go with interior designer is worth it.
If you want to Save Money And Time then going with interior designer is best.