Just nibble.. Thats what I do.. Remember that your playing BTC here, where we all expect it will be going to the moon anyway.. so in that context most of your trades will work out anyway.. But if your at a base or just under it, and you really get the impression that its about to turn up, then nibble.. let's say your account is $10,000 bucks, then a nibble might be $300-500 .. it will help you control your emotions, because atleast you can participate.. and if it goes up you get a small reward, and if it goes down, that would be awesome because you can actually get a real position.. so its win win.. but a word of caution, if you do make a few successful nibble trades, don't start sizing up where you should only be nibbling, or you will find yourself trapped.. remember your nibble has lower odds of success, and that we profit big from when everyone is surprised and in a panic.. you don't ever want to be the one surprised..