help travelling to Italy as a minor

there's a festival in Italy i plan to attend ill be 17 years old travelling from the UK on the 2nd of september and id prefer to go alone

from reading online i've only managed to confuse myself even more the only thing i'm certain on is that my passport is all in order. However in terms of what other documents i'd need to enter the country and acquiring accommodation i'm lost. If anyone could help point out exactly what id need and how ill need to organise this trip it would be greatly appreciated.