If you fear you might forget to count the Omer, you can subscribe to the OU Sefirah Reminder Daily email. They will send you an email every day to remind you which day to count that evening. They also provide explanations and the basic laws of Sefirat HaOmer.
This is the second time I’ve used it and I find it quite useful, especially after a few weeks have passed and you have lost count.
Hannah's Nook 