Dunno what SHB is supposed to stand for, so I can't help there until someone tells me what it means.
Fox and Sheik are both matchups where you need to temper your defensive game with huge offensive outbursts. You need to recognize situations where your approaches are safe and make them count. Sitting back on your laser all day won't win you matches vs. good top tier players, but thankfully Falco has beautiful combo options on all of them, so need to use the laser to bait your opponent into a position where you can reasonably approach and then take full advantage of the situation.
Dittos are annoying and very much about Laser control. The more I play Eggm, the more I realize how far I fall behind in dittos once he lands a Laser, as it typically forces me into my shield which is precisely where you don't want to be. Like vs. Fox and Sheik, every combo should be a big deal in dittos, so losing control of the match is really bad. It also means that when you get an opening, you d@mn well better make something of it, because you know that if your oponent get one, he will. Knowing how to mix DJ FF Lasers into your SHL game is crucial in this matchup, especially on FD.
Against Roy, ban FD, ban FD, ban FD, and after you've done that, you should really consider banning FD. The way DI works on his uthrow, you can only get somewhere in his CG by DIing behind him, which means that when he dashes and regrabs you, the only way you can DI to get somewhere is back where he came from. If you DI the way Roy is facing, you essentially go straight up, which is a free regrab/sweetspotted fsmash/shffl uair -> sweetspotted fsmash. What this all means is that even if you ban FD, if he grabs you and you don't have a platform that you can get to imediately, you're not going to get to one, and if he's competent, you're going to die, since even with good DI, Roy's sweetspotted fsmash will kill you at ~ 60%.
OK, so that's the bad news, the good news is that you have a gun and he doesn't. You also are a top tier character with some ballin' combos and he's a scrubby character who's entire game crumbles if he can't land an fsmash. Shoot lasers, use them to control space and don't get grabbed or dtilted (since dtilt pops you up to grab height). Roy doesn't control your approach nearly as much as Marth does with a SH, since he falls way faster (meaning he can't just hang there and wait on the fair) and his "tippered" fair leads to nothing as opposed to everything. That means anytime Roy is in the air, you should be looking to approach with nair and if you somehow manage to not get anything out of it, you want to gtfo of there so that you don't get grabbed. Roy's a relatively fast faller, which means you can combo his balls off, so make the most of it.
Also, if you're new to advanced techs, don't expect them to do anything but hurt your end results for awhile. Honestly, you'd probably do better vs. your friends right now just picking sheik and walking around ftilt -> fairing them. However, that doesn't mean you shouldn't keep up with them. Once you really feel comfortable with ATs, you'll start to realize how you should really use them in match and you'll notice a very very sharp incline in your play. So basically, don't get discouraged, you need to use ATs in matches to understand what they're actually doing, so stick with it and focus on improving your understanding of the game not on winning individual matches.