I'm not a great fan of going up a ladder, but sometimes needs must and all that. I did once some years ago have the feet slip back whilst at the top which was a wee bit scary :-)
Someone at the foot is preferable, but not always manageable, round the back of the house I use an old concrete Fox (of all things) we found in the garden to wedge put against the base, but that lacks a certain practicality.
I was wondering about the various bases, supports, stabilisers that are around nowadays. Anyone got any experience of any of these?