No, sorry, just wear them the whole time. There are loads of old wives' tales, but I've always found it just pays to wear them in gently at first. If I get a replacement pair I just wear them round the office for a few days, just to start stretching and creasing the leather. After a few days I'll take them for a run. And so on until they're ready to go.
Someone did once tell me to piss in a new pair, swill in around and leave them overnight. Result? Stinking boots that still needed to be broken in properly.
You can use something called Neats Foot Oil to soften the leather, but you're guaranteed to never ever be able to get a shine on the leather ever again.
The comfiest boots ive ever had were ones i had new for adventure training and got soaked thru. i did a fair few miles in them wet and just put fresh socks on, they were like slippers. i did this with ever pair after that and broke them in within days. just worked for me so it is an idea?