In Wales, the NQT (Newly Qualified Teacher) year can be completed on supply (obviously it would take longer to complete). I didn't want to complete my NQT year on supply but had no choice as it i didn't secure a job.
But my External Mentor keeps emailing me saying we need to sort an observation soon before i reach 140 sessions. I have done 55 sessions so I feel I have plenty of time and realistically I don't think it's ideal to complete my observation in a random class as i think that's an unfair advantage compared to those who actually have their own class.
I emailed her and said I don't understand how it works, am i supposed to get in touch with a school to see if i can have my observation there or do i wait until im prebooked?
She said usually people have their observation on prebooked days and hopefully we can get it done this term.
But i cant magic a prebooked day up. Last term, it was mostly day-to-day. And even if i get a prebooked day, being observed in a class i dont know seems bizarre 
I understand if i was booked in a slot.
I, personally, would rather wait until i have my own class but in Wales you have to claim all your supply days so there is no choice.
I am currently enjoying supply and it's only this observation that's stressing me out. Some days I get TA days so it's not always teaching.
This half term, i have been so stressed, unsure whether to just contact a school i have been to a few times to do it there. But it all seems so complicated - asking the school, then finding out what days my mentor is free and what day suits the school (that's if they'd agree),
And it also means taking a day unpaid which like a lot of people, i really couldnt afford to do :(
I just feeling like crying and it's getting me really down. So much on my mind it's making me feel zombie-like this week.
Needed to vent :( i feel stuck