Yes, have a massive clear out for photos, cram your cupboards as full as they'll go with stuff you don't want to get rid of, fill up the car, loft, shed, garage etc and if necessary, move things like toddler toys or mismatched furniture from room to room as the photographer goes around. Dress the place up nicely with your best linen on beds, fresh flowers on the table etc. Don't be afraid to (politely) direct the photographer a bit and ask for more photos if you aren't happy as they are so important in getting people through the door in the Rightmove age. A really good agent/photographer will touch up the photos as well and make them look really nice and bright... look at their previous work online before booking with them! Equally don't let them put 100s of shots of the same room from slightly different angles up on the ad, unless your place is huge one or two of each room and a few of the outside and garden is plenty.
For viewings its tougher as the buyer may open your cupboards and look in your loft so you want to avoid stuff raining down on them if you can help it 
but I think they are looking at the house 'lived in' so it is also more acceptable to have a (little) clutter visible, I always filled the car up (make sure you drive it around the corner!) and garage before each viewing and made sure anything that could be put away or hidden was.
The general advice on preparing to sell is not to spend a lot of money (you won't see it back) but make sure you finish off any little DIY jobs that are hanging around (things like loose handles or cupboard doors or dripping taps will make the buyer suspicious that the place hasn't been looked after) and small investments in things like a lick of paint over any tired walls, nice colourful soft furnishings and general cleanliness and tidiness (including a tidy garden) will help.
I never really subscribed to the whole 'you're selling a lifestyle' thing that is sometimes peddled - I have only ever sold over-filled small houses in somewhat scummy areas, so the lifestyle, if any, I was projecting was more chaotic barnyard than luxury zen 
! But I do think people are generally fussy/nervy when buying a house, and that doesn't change whether it's an average-at-best 2 up 2 down terrace in Dullsville or a 10 bed penthouse in Mayfair - you have to try and think what might put them off (e.g. lack of storage, dark/gloomy rooms, looks unloved, smells funny etc.) and minimise it where you can. Smell is apparently a big factor in people's first impressions and unfortunately the last place we sold was next door to a very smelly man whose house reeked of fags and damp, it was the first thing you smelt in our hallway although not so bad elsewhere in the house. I didn't want to cover it with fake Zoflora-y smells as I thought that would be even more suspicious so I took to doing nice smelling cookery like baking bread or cakes before viewings and wafting the dishes around the hall right before they got there (slightly backfired one time when the EA let themselves in 10 mins early and there was a random pot of coffee sitting in the hall though!)
Try and take the children and dog (if you have one) out for viewings, even if you have to sit in the car (if you can fit around all your stuff of course!) as it's a bit stressful trying to wrangle little ones and show the place off at the same time and you want your buyers to feel comfortable. If you have to have viewings whilst the DC are around maybe settle them in front of the TV in the hope they'll sit quietly (ha!)?
Good luck, hope it sells quickly for you!