Русско-англо-русский юридический словарь

‘he never gives in, and that's half the battle’

‘But let's take it a step further and say that recruiting and training is only half the battle.’ (Oxford English and Spanish Dictionary)

For a lot of jobs, getting an interview is half the battle. (Cambridge Advanced Learner's Dictionary & Thesaurus)

We know that if the trade unions are consulted that is half the battle. (Hansard archive, Cambridge Dictionary)