Why not have a go yourself? It is a very straightforward job to do an engine oil and filter change, it is also dead easy to change the oil in the gearbox and final drive. Changing the air filter is also dead easy, just remove the seat and there it is. All that really leaves is a check of the valve clearances and there is advice on how to do this in the Font of All Wisdom section. But if you still feel unable to do it why not do the oil and filter changes and then take the bike in to either an independent or to the BMW dealer at Rednal. Have a go you might surprise yourself with how easy it is.