freelancing

I'm looking to increase my capacity in bookkeeping and was looking at people per hour. Its made me wonder whether you would need to have a copy of all the bookkeeping programmes or whether all clients would just have to use which ever one I chose to use? I'm just waiting to speak to a company who may be interested in employing me but for personal reasons I can not fully commit till the end of January so was looking at my options for working freelance till then.
any advice opinions and experiences welcome.
thank you
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