Anyone out there have experience on Ovidrel injection for trigger in a full stim IVF cycle?

We used Pregnyl in our 1st stim cycle and apart from the little bleed on the site no big side effect on me. I think I've read somewhere it is really painful for Ovidrel, is that true? I haven't open the pack yet but how big the needle is?

Sorry sounds a bit chicken here...my trigger most likely to be this the next 2 days, so want to mentally prepare for it...any advice would be lovely ladies.