You can do it both ways.

I would like to know how to pray Witr and Tahajjud at home? i.e. silently or loudly like Fajr, Isha prayer?

Prayer | March 23, 2014 6:24 pm
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Eid prayer – whether Eid – ul – Fitr or Eid – ul – Azha; if any one leaves them intentionally or unintentionally, is there any sin on him? Does Eid prayer comes under obligatory prayer or voluntary prayer (Nafl)?
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I would want to know whether my prayer is valid even though i pray behind an imam, but i make personal mistakes like forgetting to recite fatiha