So a couple of thoughts from me:
60/40/20* (or your TOCs equivalent) is as safe as houses. Around a year in, your confidence will be up, sticking with this approach to all signals will basically never let you down. Even then, if in doubt, take (an extra) 10 out.
Don't be afraid to use risk triggered commentary in an empty cab. TPWS on bay platforms was one that I often came a little too close for comfort with - its very easy to zone in on the buffers and forget the OSS risk. As a result I always (even almost a decade later) vocalise "15 at the platform, 8 for TPWS". I would, however, caution against a whole route commentary as it waters down the value of RTC - I personally only vocalise risks (eg: double yellow, yellow, red as I cancel the magnet and bay platforms).
Distraction will happen - it might not even be anything other than the job distracting you (eg: pass comms, Guard calling you etc), don't beat yourself up if you make a little slip - build in enough resilience to your driving style to catch an error before it becomes serious. If your minder hasn't given you check speeds for stations, build these in - so you'll have a shut off point, brake point and one (or more) check speeds - it gives you a number of opportunities to get back on your brake curve if anything goes wrong.
And if it does go wrong (big or small), we've ALL been there. Hold your hands up, be honest about where you went wrong, learn from the experience and don't let it crush your confidence. Despite what some in the mess room might say, I guarantee there's not a single driver than hasn't done something wrong at some point in their career, and there'll be a lot more who've had incidents than will admit it - we're all human, it happens.
* 60/40/20 is 60 at the double yellow, 40 at the single, 20 at the magnet for the red. Differs between operators depending on speed you're operating at and braking capabilities of traction - just incase that's a new one for you.