How about you work out (approx) what your bill will be if you paid monthly. Put that money into a savings account each month. When your 6 monthly bill arrives pay it. Simples
Find out who you are and do that on purpose (thanks to Owain Wyn Jones quoting Dolly Parton)
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Put that money into a savings account each month.
When your 6 monthly bill arrives pay it.
Simples