All the scuba diving old-timers will tell you that the constant barrage of tips and advice have only good intentions. They are meant to keep you safe, alive and allow you to become a better diver so you will have more fun, more often. PADI is another great resource for finding information on how to do any number of things, including how to control your breathing and what you need to know about buoyancy control. What you really need to take away from all of this is that you ought to learn how to be efficient. This relates to how you interact in the water, the manner in which you breathe, and how quickly and efficiently you are able to get suited up.
A must for all divers is to be able to make the right adjustments to be at neutral buoyancy. Depending on how deep you are, it is important to know how that will affect of your buoyancy. There is more pressure as you go deeper, which compresses bubbles causing your wetsuit to lose its buoyancy. You may feel that you are underweight, while you are at shallow depths. For the reasons just mentioned, as you go deeper you will no long feel underweight. That is one good reason to buy your own wetsuit if you plan to dive in waters that require it. Owning your own wetsuit would allow you to learn what happens to buoyancy at certain depths.
Breath control is an area that beginner scuba divers will need to learn with experience. Breathing with a scuba mask on, and breathing while sitting at home, are two completely different things as most novice divers likely learn. Some novice divers will actually try to hold their breath while underwater, something that they should not do. Other than the fact that you are depriving yourself of oxygen, doing so can affect your buoyancy in the water as well. Some novices will also breathe in too much air too rapidly causing them to get lightheaded while in their suits. Keep these things in mind as you learn more about buoyancy and breathing in relation to scuba diving.
Be certain to equalize in the beginning of your dive and repeat frequently. Divers familiar with procedure would encourage a novice to do a means of equalization in advance of getting your feet wet. The reason would be to get your ears ready for what will happen next. It is essential that you repeat this procedure while you are in the water every few feet. You are able to circumvent any ear difficulty when diving and no doubt this is beneficial. If one of your ears is not cooperating with the other; simply tilt your head with the difficult ear at the surface. You will find all kinds of rules, regulations and safety tips associated with scuba diving. Your safety should be reason enough for the rules. Unfortunately rules were meant to be broken, and divers do it too, even at their own peril. Usually when you hear of a deadly situation involving a diver, it was because of taking shortcuts that should have never been taken.