the first day i came to the dojo to "check out" jujitsu the instructor wanted to give me a free lesson... he threw me with the group...i had no gi, no experience...nothing. we stretched out then worked on some teqniques for an hour and the last half hour of class we fought for submission...(same as we do after every class) the other students didn't take it easy on me cause i didn't know anything and i thought it was kinda harsh...i got arm barred, choked out...the whole works. (of course that ends just as soon as ya tap out...) i found out after class that sparring like that with more advanced students even though you don't know what your doing, gives you an instinctive kind of defense and i'm glad that we do it...i think you should spar as soon as your allowed. but hey don't take my word for it try it for yourself