Oh yeah! I worry about running out of time even though I started recently (it's a very ambitious project), not be able to do my technique, doing stats, fieldwork, not understanding my topic (certain elements), what my supervisor expects of me, how we interact(haven’t sussed it out yet), when he/she will realise they have made a mistake in choosing me (don't feel very confident when I realise I've forgotten how to do alot of stuff!) etc ....... the list is endless!!! But it's a good experience so far!