I spent a bit of time trying to find a way into the headlight bulbs from within the engine bay until I came across the link below.
GD Bulbs are much easier and simpler to replace from behind the front wheel arch liners!
i always take wheels off too, there is more room on passenger side due to no washer bottle. Because of mileage I cover I liked to change the headlight bulbs every 12 months and chose a nice summers day to do it - wouldn't want all that taking wheels off and crawling around in the cold, wet and dark of winter - and the high performance bulbs rarely lasted much past 15 months anyway.
Those 90/100wat bulbs shown on fitfreaks forum are not road legal in UK anyway, but Osram nightbreakers or phillips x-treme bright are plenty good enough.