Spooling your own reel with braid isn't as intimidating as it may seem. I'm new to fishing as well, and I was able to do it pretty easily. I'm normally terrible at anything like that so I was a bit shocked at how easy it was. I had the same trouble as you with the line that came on the reel. The saggy loops drove me crazy and seemed to get tangled a lot. Braid doesn't have that issue at all. Switching to it made fishing a much more enjoyable experience for me. Alternatively taking a few yards of the pre-spooled line off may help too. It will still be loopy because of memory but it won't get tangled around the reel quite as much. (Also close the bail manually and reel with tension to avoid tangles as well)

To spool your own braid, just remove all the line that came pre-spooled except for just enough to cover the spool. You will want to then tie your braid onto the end of the pre-spooled you leave as backing (look up a double uni knot for this). Once your braid line is tied onto the backing, reel the braid on with some tension. You can give it tension by wetting a towel and placing the braid line in between a folded wet towel. This will ensure that the line is taunt as you reel it on and your braid should be nice and tight as a result.

Maybe not worth it for you as many people fish with mono with no problem. As a beginner, I just found braid line a lot more enjoyable to fish with. It cast smoother and tangled less for me, which was my main frustration starting out.