Hello Joan and welcome.

I am no expert but will give advise.
I'm not keen on you waking yourself up at this early stage of your LD endeavours and I would suggest that you allow yourself to sleep normally and concentrate on keeping the dream journal and doing reality checks and making them habitual.
If you wake yourself up during a REM sleep, you may disturb a dream or a potential LD from occurring. Making a habit of writing down your dream when you wake up will improve your dream recall and you will form the habit of waking up after a dream.
I have found that the best time for REM sleep and having a LD is during an afternoon snooze on the weekend.
Dont push yourself into trying to LD as frustration and anxiety will combine to inhibit your progress. Start with the journal to improve your dream recall and also do regular reality checks. Starting at the beginning will give you a better chance of success more quickly unless you are a natural at LD'ing.
How do you climb a mountain? One step at a time.

Good luck and best wishes.