You may have to braid several. For a large diameter candle, it make take several pourings for the wax cools on the outside first, thus leaving a gap around the wick which must be filled. Wax burns skin. Wear protective clothing, gloves, and eye protection. There are some wonderful websites about the process-search pachal candles.
Some parishes recast their old candles to make their paschal candle.
The larger the candle, the thicker the wick. You may have to braid several. For a large diameter candle, it make take several pourings for the wax cools on the outside first, thus leaving a gap around the wick which must be filled. Wax burns skin. Wear protective clothing, gloves, and eye protection.