Quote:
So I should experiment with each exercise so I can only lift 12 reps, for 3 sets? Can you give me a routine I could use this technique with? Bearing in mind the results I want? I would fuckn love that

Exactly.
Ok here's a routine that will get you started for a few weeks. Remember if you're in doubt about anything ask a fitness instructor in your gym. Correct posture and form will not only help you achieve results quicker, it will also reduce the risk of injuring yourself.
1. Warm Up
You say you cycle to the gym so I'm going to consider that a warm up.
2. Pre Stretch
Do stretches, 10 seconds for each one. If you don't know how to stretch I will post it here but I'm skipping this part cos it's 2:15am and I'm going to bed now ;P
3. Weights
2 to 3 Sets, 12 Reps. Leave about 1 min 30 seconds inbetween each set although if you feel this is too long reduce it to 1 min between sets or 30 seconds. You're the judge of it. It is better to leave minimal time.
Chest Press - Chest - 2 seconds pushing the weight all the way up but don't lock your elbows, pause, 4 seconds on the way back down, breathe in pushing the weight up, breathe out bringing the weight back down
Seated Pulley Row - Back - 2 seconds pulling the weight all the way towards you, pause, 4 seconds on the way back down
Lat Pull Down (Wide Grip) - Sides (The "V") - again, 2 seconds pulling the weight down, pause, 4 seconds letting it back up
Shoulder Press - Shoulders - 2 secs up, pause, 4 secs down
Bicep Curl - Biceps - 2 secs up, pause, 4 secs down
Tricep Kickback - Triceps - 2 secs up, pause, 4 secs down
Ab Curl - Stomach - 25 reps, 2-3 sets (if you can't get that much starting off just do as much as you can)
Back Extension (Careful with this one don't go too far when you're moving because you can do yourself alot of damage - in fact ask a fitness instructor in the gym to show you how to do this one correctly, don't attempt it until someone shows you) - Lower back - 20 reps, 2-3 sets
4. Post Stretch
Do stretches for all muscles used. 30 seconds each stretch.
When you're able to do 3 sets of 12 (excluding ab curl and back extension) very easily then you know it's time for a new programme. Come see me via pm at that stage if you want. Let me know how you get on.