Paul J's adice is sound.. but it just scratches the surface. The trick to landing an airplane, is to use the classic technique without even having to think about it. You control your airspeed by pitch, and you control your rate of descent by power. -If you're coming in high, but at the proper speed, you FIRST reduce power and THEN pitch to keep the airspeed nailed. -If you're coming in low, but at the proper airspeed, you FIRST add power, and THEN pitch to keep the airspeed nailed.-If you're coming in at the proper altitude, but going too fast, you FIRST pitch up to reduce the airspeed, THEN adjust power for the rate of descent.-If you're coming in at the proper altitude, but the airspeed is too low, you FIRST pitch down to increase airspeed, THEN adjust power for the rate of descent.As you can imagine, it's always a mix of the two, and sometimes you make pitch/power adjustments simultaneously, always keeping in mind that counter-intuitive rule, "Control your airspeed withe the yoke, and control your rate of descent with the throttle"NOW.. the tricky thing is that it all gets blurred a little with turbo-props or jets (especially big jets), because thrust changes happen slowly compared to piston aircraft. These aircraft require that the approach be much more stabilzed, much further out. Airspeeds have to be nailed... and flaps have to be used properly. In a piston-powered airplane, you can get away with using flaps like speed-brakes.. whereas with a jet, they're just a required step in the approach process. Their use isn't as flexible, but more rigid.Obviously, the only way to master this stuff is by practice, practice, practice. And you're much better served mastering things like nailed airspeeds and stabilized approaches in smaller, slower, more forgiving aircraft. Most sim pilots will have none of this.. they're bound and determined to be, "Instant Airline Captains".. but all you'll really accomplish by force-learning some sort of technique that will get you on the runway in a jet, is to reinforce BAD, unrealistic habits.You should be able to consistantly put a C172 onto a runway, and to a complete stop, in no more 800' of runway, before moving on to a bigger/faster airplane. Ideally working your way up the size/speed/complexity ladder logically (i.e. not jumping right into jets). Flying a textbook traffic pattern in a C172 (keeping the altitude perfect), and flying touch-n-goes, works as well in a sim, as it does in real flying, for strengthening your piloting instincts. Eventually, things like the runway image, and the airplane's attitude, and that altimeter reading, will all spell out to you a perfectly sensible message.. and you'll know just how to reply.As you're learning.. there aint no fun nor challenge to letting the autopilot fly your approaches.. might as well be a passenger. :(