[Koha] new versions

Trying these questions again... We currently have version 3.0.0 and want to update to 3.2.6 this week. We are having the IT consultant that originally installed Koha this winter do this. Any potential glitches or problems that I should be aware of? Will I have to reset anything in the new version? Hoping the transition goes smoothly. Also, would it be better to wait for version 3.4 in April? How different will this one be? We don't have full-time or even regular IT help - have to hire/pay for each service, so we want to use our money wisely. Thanks, Shelley