I've taken my Holgas on trips and although it's a fun camera, there are a couple of things that make working with it easier.
First, do a google of 'holga modifications' and you find a wealth of info on improving it.
The only one that is absolutely essential is taping the red window since it is a source of light leaks. The others depend on how much time you want to spend on it.
I have three Holgas (hey, for 16. each, why not?) and have done a wide range of mods to them, from completely taping them with Gaffers tape (or not), flocking the insides with black matte paint, adding another f stop, close focusing, etc.
Another suggestion to consider is to buy a second Holga and a large film changing bag.
Its a lot easier to start the day with two Holgas loaded with film (24 exposures) and one one is done, pull the second (or third, which is why I have 3) out and keep moving on.
Changing film can be a slow and needs to be done in a dark room, closet or film bag.
When the 2 or 3 cameras are finished I usually take a break, have a cafe or beer, and change film in all three cameras.
Of couse, you can work with one camera, however 12 exposures can go pretty quickly. I also take my film to my local 1 hour shop. They do a decent job and its only a Holga, anyway.
Have fun, they are great cameras!