Hey Steven,
With dressing a property for sale, it's about getting the balance right. Yes, most of your personal stuff needs to go, but if you strip it back too far, a stark living space can be just as off-putting to buyers too. Often it's about replacing your personal style with one for a broader appeal. (just because I love pink in every room, it doesn't mean anyone else will!) People need enough room to be able to imagine themselves in the property, but clues to help them imagine that! Don't forget it's not only about the visuals - appeal to all the senses - scented candles, fresh flowers..etc.
In answer as to whether to be present at the viewing, I always suggest being there to let the viewers in and greet them & then disappear to the garden/office. Then they feel free to view the property at their own pace, but you're there if they want to ask any questions. Get rid of dogs and kids if possible though!
Hope that helps! Zoe.