
I am an LSA in a school for children with special needs (we are a PMLD/SLD school). The work can be very challenging (bruises, scratches, bites, punches on us are a regular thing) but also immensely rewarding. You get very attached to the kids and become very involved to the point where you know their families well also. Although I have a teaching assistant NVQ, some staff are taken on and trained while working. We have regular in-school training to and work all inset days (normally LSA don't work these in mainstream schools). We are all competent signers, and I have been trained up to assist with seizures and catheter assistance (as well as being a first aider). Autism training is also recommended.
Pay isn't great - but I hope to be in this job for a long time (4 years at moment) because of the enjoyment and reward factor. Your best bet would be to send your CV to local schools for children with special needs and they can put you on their waiting list (sometimes staff turnover is high). Remember though: they are not special needs children, they are Children with special needs. The child comes first (it will help in interviews). Good luck.