As many regular readers will know I carry out BTO Timed Tetrad Visits as part of the work towards the 2007 2011 Bird Atlas. These are specifically timed visits over pre defined areas counting all the birds and species that are seen or heard.
An important part of this is the ability to recognise what you are seeing or hearing............obviously.
To that end, the BTO are running a series of training courses here in the UK that you might be interested in. Details of courses, locations and prices can be found via the link.