If you have the necessary expertise, then of course. Otherwise, you are strongly advised not to work with historical furniture if you do not have the necessary knowledge, because an object is quickly "restored" and then the damage can only be repaired with great difficulty.
If your furniture or wooden object has a greater financial, qualitative, ideal or age value, then you should in any case commission a restorer with the conservation and/or restoration.
A layman should generally avoid laying a hand on shellac surfaces. Descriptions on the internet may sound very simple, but they can only be applied flawlessly with the appropriate practice.
Old layers of paint on farmhouse furniture often conceal old paintings. These layers of paint must be removed professionally. Fittings and hinges are also often cleaned too sharply or not removed at all.
If you have furniture in need of restoration, consult with me. However, if the costs are too high for you, I can give you some advice on how to repair and treat your old treasures with a little craftsmanship.