Judging by the photo I think that probably most of the fluffyness is older hair which will groom out (it usually has a blue tinge in the black dogs and is a paler brown in the liver dogs). As Freya says with a coat king it will come out and she'll look alot better.
I invested in a really good pair of single sided thinning scissors and a pair of 4" snub nosed scissors (both Witte Roseline) - they were both quite expensive but they make the job alot easier. I'd used other types of scissors before but the difference was amazing - even for this Yorkshire Skinflint. Although if you work out how much you'd spend on sending them for grooming you soon make the money up.
If you know anyone who is good at grooming dogs a demonstration is worth alot. I learned alot from Mary when we were in Anglesey the other year and I've recently done a short course at Bishop Burton called 'Groom your own dog' - so I now have a good idea what I'm doing and have certainly gained the confidence to give it a go.
You know what they say - the difference between a good haircut and a bad one is about 6 weeks

-