The first step is to join the stretchers. Lay them out on the floor, then push the corners together by hand. If necessary, tap the corners gently on a carpet or with a rubber hammer (be careful not to dent the wood). Check that they're at right angles, either with a set square if you require mathematical precision or with something that has a fairly accurate right angle on it, such as a book.

Roll out your canvas, put the frame on top of it, then cut it to size, remembering that the canvas has to fold over the outside edge of the stretchers. Rather be over-generous in the size you cut and trim off the excess when you've stretched your canvas.

The most important things to remember when attaching your canvas to the stretchers is to work from the middle outwards and in opposites. So, starting in the centre on any side, staple the canvas to the back of the stretcher. Put in about three staples, approximately two inches apart. With your first few canvases, you'll probably put in more staples than you need; practise will give you a feel for this. Move to the opposite side, pull the canvas taught, and staple the middle in place. Repeat with the other two edges.

Now staple one edge from the middle to the one side. Remember to pull the canvas as tight as you can - an extra pair of hands is useful. Then do the same on the edge that is diagonally opposite. Continue like this until all the edges are in place. If you're stretching a very large canvas, don't staple all the way to the corner in one go. You'll get better tension by doing it in sections.

At the corners, fold the edges of the canvas neatly and staple the one on top of the other. If your canvas needs a little tightening, tap in the frame keys. But don't rely on these. If you find your tension isn't good, rather remove the staples and start again.

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