Its will be tough IMO, maybe if you only do the stuff you really care about.
But if you want to do Hagrids you are talking at least an hour in line as there is no express pass.
A lot will depend on when you go, but Universal is much busier then in the past, at the level of Disney IMO
I just got back from a trip the last two weeks and I found it very busy for this time of year, compared to past years.
I try to go first week of March as its between the various spring breaks, but not this year...it was pretty busy every day.
Also did you consider one night at one of the hotels that gives you express pass? That would give it to you for two full days, plus you get a room. You can check in at 7Am even if you room is not ready, get your passes and have it for the full day, plus for the next day. It might be worth pricing out.
Also if you stay on site you can get into the parks at 8Am and go right to Hagrids (which is what most people do) assuming that is the park with early entry when you are there. That lets you get it done first thing and depending on how early you are there you may only wait 15 to 20 minutes. It is worth getting it done first thing to take that pressure off.