I think that you were a bit limitted with your set up at home.
One thing though - I would steer clear of the smith machine if I were you. Those things are the cause of many injuries (only one predetermined line of motion - everyone presses in a different way and it tends to put alot of strain on the elbows and shoulders). The best thing to do at the moment is just not work to failure, and build your confidence with the barbell. 5x5 is a good routine for that - two increasingly heavy warm-up sets and then 3x5 at the same weight. Generally take a weight that you can press for 7 reps and start from there. Add 2.5kg every workout, or every other workout.
Good look with the gym training - I hope to see some heavy squatting from now on
Jonathan
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