It is deffo in his best interests.
Basically yes it is a massive minefield, paperwork hell, form,s galore, refusals, and hard, hard work. But you just take it a step at a time, with suport from your child thereaposts, portge worker if you have one and IPSEA, and us of ciurse.
Once you have that statement, and the sooner you get it the better, then your childs nursery / school will be given the funds to provide an additional teacher who is there just for your son.
I had Lottie statemeted at about 3yrs old and shge has her own teacher for 10 hoursa week. When she goes to 'big school' in September she will have a 1-2-1 teacher for 25 hours a wwk.
I was refused a statement at first as the panel said that Lottie was "developing age appropriate skills". To which I basically said "bollocks, what's age appropriate about not walking and talking at 3yrs old?" So got my staement sorted.
It's hard work, but worht it in the end.
Good luck.