My way
1) always keep image uploads seperate to listing editing and do it first.
2) prepare all components, description (in Word), image, templates, profiles and seller details and then assemble the listing online. Minimises the risk of on line hiccups losing my work.
3) use IE6 - most problems seem to revolve around IE7
These 3 rules significantly minimise the amount of swearing I do whilst sitting at this keyboard.