That's not a stupid question at all. XD I generally recommend having a handler at all times, particularly in crowded areas or events that you're attending for the first time without prior recon, as it were. All suits, whether fullsuits or partials, have serious vision and hearing impairments that can spell a rough time for the newbie fursuiter.

I'm experienced enough that I'll go to events, (inside and outside of 'convention' spaces,) without a handler, but if my handler is able to, I prefer them by my side. For example, I was in a group dance at an event in my local town that I've been to solo before, and while everything was fine up until and after, while I was busy, (and thus not scanning my surroundings,) some guys came up and were trying to yank my tail and then actually trying to trip me, and my handler stepped in, saving me from a rough night, (and those guys from a boot in the face,) and possible injury to the people close to me if I would have fallen on them. Fursuiting isn't tough - it's dealing with PUNKS that can be!

But yeah, it mostly depends on the event. Different suits do have different needs - for example, having a handler with water ready is good when in a fullsuit or realistic suit, but knowing the limits of the suit and your own experiences is key as well.