"Is it best to just get in my maximum amount I want to pay, and leave it at that? If I remember from last time, sniping doesn't work."
There are two schools of thought on this as it relates to HiBid.
In theory yes, one can (and or should) simply bid highest amount willing to pay and wait to see if outbid.
HiBid's "soft close" means any bids that happen within final four to three minutes cause auction to restart for another three/four minutes. This allows anyone outbid to up the ante. This will continue long as bids are received within final three or so minutes.
However, it isn't wise to wait until final one minute or so as auction will begin closing (similar to "going once, going twice...., at live auctions). IIRC previous time at bat you waited until final minute or so to bid which was too late.
On bidding highest amount and walking away... Some do say certain auctions on HiBid use shill bidders to drive up prices if they believe something is going for too little money. Myself have not seen evidence of this but people do speak of it online and apparently such bidding is legal.
Once you have registered and entered a bid and provided have set your HiBid profile to do so you'll receive an email or text alert when outbid. This will be at anytime before "soft close" and or right through once that system has been activated.
Personally if it's something one really wants tend to watch final minutes action to see what's going on. May up my bid during "soft close" to see if other bidders have any moxie on the ball.
Usual caveat applies: bid with your head, not over it.