The main advantage of setting up a limited company is that it creates a clear legal distinction between your personal finances and those of the company. So, if the company goes bust, the creditors can't pursue you for the money.
The main disadvantage of setting up a limited company is the additional paperwork. You have to submit annual accounts, auditted by an accountant, to Companies House. Additionally you have to keep minutes of directors' meetings, etc.
If your way of working is likely to involve you in setting up credit accounts with various suppliers where, at any one time, you might owe thousands of pounds for the supplies you've received, then there might be some point in setting up a limited company. (i.e. If the firm went bust, you wouldn't have to pay these debts from your personal bank account). Also, if you expect to be employing subcontractors and you could reach a point where you owed thousands of pounds to those people, it would be sensible (for the same reason) to operate a limited company.
If, however, (as seems more likely) you'll be buying your paints, wallpapers, brushes, etc for cash (or opening a credit account where you'll never owe very much at one time) and you won't have any subcontractors or other people to whom the firm could owe lots of money, there would be no point in seeking the financial protection offered by the formation of a limited company. All that setting up such a company would do, would be to give you some extra administrative headaches for no real benefit.
Chris