Can anyone tell me how easy is it to access and Clean or change the Idle valve control on My FIESTA MK6 DURATEC 1.3 8V.

Sometimes, but more recently the tickover tends to stick at 1200revs ....but if i take my foot off the clutch it idles fine. if i push the clutch down the revs go back up. Eventually it does sort itself out...but is annoying.....

Help!