You're close; three! But the number of belts isn't the issue. The challenge is that when the primary belt is released, all four camshafts move. Two sprockets then have to be held in a precise position (against valve spring force) whilst the new belt is threaded around the water pump, idler wheel, crankshaft and hydraulic tensioner. Trying to do that single-handed using Tippex marks really is a folly.
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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