Product review (5 stars): more like three minutes
No matter what parts you can buy piecemeal, you owe it to yourself to buy this as an assembly.  As an assembly, you can replace it in less than five minutes; more like three minutes, only two screws and one simple plug.  If you disassemble to replace an ice tray, tray sensor, arm, or whatever, you're wasting time and money.  I keep an extra on hand as this is a high failure rate item.