I think it's grand if you know where you want to go. Any time I've been to London I've had one of those little maps in my bag and before I get on a tube I know what line I'm looking to get on and what stop I need to get off etc and I feel safer having a little plan in my head so I'm not wandering about the stations like a lost tourist
Looking at the map if it was me I'd take Circle line (yellow) to moorgate and then change to Northern Line (black) to Euston or take the Central line (red) to Tottenham Court Road and then Northern (black) to Euston but someone else that uses them more often may be able to give better advice knowing journey times and such
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