Not all toolkit items have to be expensive gadgets, for instance had you thought that a magnet might be just the thing for collecting a screw dropped into an inaccessible place.
A notepad and pencil is ideal for writing down measurements, ideas, shopping lists and planning. (Poetry and/or betting odds optional)
Carry a rubbish bag, preferably a strong rubble sack, to keep debris out of your working area.
Use a surface protector to make cleaning up easier, we favour the sticky plastic type that avoids snagging yourself up in dust-sheets, otherwise another really good surface protector is hardboard, cheap and durable, great for long term heavy duty work like replacing ceilings or removing plaster.
For these and many more tips when starting a project visit our Tips and Tricks page.