The jackfruit will put of an aroma,, which is pleasant to some and some feel it stinks. The fruit will also have give to it when you press/squeeze it.
you can use gloves if you want. Use a knife you dont care about, just in case you cannot get all the latex off. Once it is ripe, you could refrigerate it which can suppress the latex. Otherwise, spray the knife with pam and dig in and have fun...