If I were you I'd replace both bulbs while you're there. (3 bulbs if you have a digital clock/MFA):
Take your radio out, pull the heater sliders and fan switch off (They'll probably real tight but just pull hard) Then pull the heater panel off, the fan switch will slide upwards and unclip.
Pull out all the switches/blanks and make a note where they came from. You don't have to remove the steering wheel but it helps if you do.
Now you should be able to see all the screws holding the dash surround on, there's 2 above the clocks, 2 behind the heater pannel, one at the far right behind the headlamp switch, one behind one of the dash blanks and one above the radio. I think thats all of them but you should be able to see for yourself.
Pull the surround away carefully, unhooking the handbrake warning light as you do so, you should now be able to get at your dash clocks. Theres a screw either side, onece removed you should be able to unhook it from the support bracket, if you let it drop down a bit you might have enough room to get your hand behind to do the dash bulbs.
If you cant reach or want to take the clocks out so you can replace them, fit a dial kit etc then remove the dash under tray so you can get to the plug(s) at the bottom, if you have the hazard switch on the dash you have 2 plugs, if its above the steering column you have 1.
Last of all, reach round the back of the clocks (I find it easier to reach round from the left, behind the support bracket) and detatch the speedo cable. It will probably be as tight as feck and you'll have a right job getting it off. Now you should be able to pull the clocks out, if the wheel is still on tilt the top of the clocks towards you and they should slide out to the left.
Just go slow and keep at it, make sure you step back and have a cup of tea/coffee when you start feeling the need to empty a can of petrol through the window and put a match to it