how to have sex with a shemale? tips?

[BlueVelvet8]

I'm attracted to feminine ladyboys and even went to see one, and it all started off pretty well. We both put on condoms and she was sucking my dick and I was sucking hers. But she got very horny and said "you have a very nice cock" and then begged me to fuck her. I have never done anal before, either with a woman or with a ladyboy, so I didn't really know how to do it and felt pretty uncomfortable, so I was unable to stay erect enough in order to enter her. How do I get over this, so that I will be able to be comfortable enough to have anal sex with a ladyboy?

Anyway, she finished me off with a handjob and I sprayed 4 times, so it was a pretty good cumshot. I'd like to go back to her but I want to know that I'll be able to satisfy her this time. WHat is you guys advice?