hi am new here,i have a 51 plate fiesta,and the clutch has given up the day after it passed its mot

,how hard are they to change?i am engineer by trade but have never tackled anything like this b4,am i gonna b way outta my depth,or can sum1 with a fair ammount of engineering abilty cope lol,its a basic finacial thing i can buy a clutch for 80quid and do it myself or the garage want nearly 300 to do it,so was hoping for sum helpful advice,as well as sum abuse prolly for owning a heap lol,cheers....ment 1242cc obv