If one bitcoin is just small percentage of your personal wealth, if you lose it, it will not affect you, then buy one.
for a total purchase of course it depends on your wish dude. make sure you buy the amount which you can afford to lose
the potential of bitcoin is very large. I would buy more than 1 BTC
Thats right bitcoin have great potential to any other other coin existing today because bitcoin have great benifits to its and if you wish to buy 1 btc now then go ahead you will sure earn big for this halving coming. And you dont have nothing to wory because bitcoin is Very safe investment it is all depends on your decision and doings on How you handle your money For long time. But we asure u its very safe to invest 1 btc for long term