awkwardness!? lol
I put mine on a board and then place them so that their bums hang off the edge, you can snip their hair without actually touching them (little bit at a time), they tend to sit still then, especially if you put food in front of them.
to get right underneath them I hold them so that their head is in my armpit (not quite, but you get what I mean) and hold both their feet in my hand. If you tip them up, bum towards your face, you get a perfect (if slightly suspect) view of their bum and bits - so you can very carefully snip round everything. This takes quite a bit of practice, so don't cut them too short at first (you need a really small pair of scissors as well) as it's very easy to accidentally snip something important.
I usually then flip them belly up, spread their legs and carefully cut between their legs - again you have to watch out for their nipples.
It's all about being confident in handling them, not letting them faff you around - if they start bucking and jumping around you need to put them in their place, they are very intelligent animals and will figure out that if they do 'X' then you can't do 'Y'
One of my lads decided to bite my wrist yesterday when he was in a compromising position being trimmed, just purely because he didn't like being belly up, I have a very small mark, but he got trimmed - I didn't stop!