Use a tweezers to plant each group of a few stems and work from one side to the other in the tank (if you're right handed working from left to right is easiest). It's easier if you plant at an angle so you're less likely to uproot what you've just planted.
I planted plants for 10 years with my fingers, then I bought some cheap 10" tweasers off of ebay and man, what a difference. I wouldn't even try to plant HC without them.
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