Hi Paul,
This advice is predicated on the motor being tuned to provide a reliable and slow idle with the appropriate size and pitch of prop.
With the motor on you can go around again if you arn't on the proper glide slope or lined up with the strip. Don't be afraid to power on and go around if you arn't 100% happy with your approach. What ever you do don't just "dump" the model on if all isn't going well with the approach speed, glide slope or orientation with the strip.
There isn't any substitute for practice

. Shoot touch and goes endlessly until you can put the model where you want it is my advice. To help with this process put a strip of plastic tape or similar on the strip where you want/need to touch down and try to land on it . In my experience it also helps most students if there is a little wind to land into.
Cheers,
Colin