What a lyre

I've been asked to join a group busking in Cambridge next weekend and the one after.  This is quite out of my comfort zone since I believe all the others  are very good, and have done it before.  However, I'm up for the challenge... I think.

I bought myself a 'lyre' which attaches to the French Horn.  Learning where to position the music and how to see the titchy notes is going to be a challenge!  Also, whilst the tunes are familiar some of the key signatures aren't.  One and only rehearsal in Cambridge on Tuesday - yikes!