Its an easy job (apart from the stripping of the interior to dry it out)
Step 1 - two foam blocks by the bonnet hinges - pull them out, there is a big drain hole under them - usually blocked with composted leaves. Put the blocks back, otherwise the space there will whistle annoyingly.
Step 2 - scuttle. It is a bit easier if you take the wipers out, but you can do it by just releasing the front edge of the scuttle and getting your hand in. Find the drains (big things about an inch wide at the top) and stuff a hose into them to wash them out.
Interior drying - total PITA, but at least the weather is good for it at the moment. Getting the seats out is not hard, and probably worthwhile.