Food Challenge

[~Temet Nosce~]

My ds has an allergy to peanuts. He has had a skin prick test but didn't come up with an allergy to any tree nuts. However my pead wants me to do an at home food challenge, with a mix of different tree nuts (cashew, hazelnut, almond etc. etc.) to see how he tolerates them and to help avoid him developing an allergy to them down the track. I have an epipen if he does happen to have a reaction.
Anyway just wanting to hear from anyone who has done this? Thanks :)