It occurs to me that when we experience meditation as a struggle it is simply because we have forgotten that we can trust it. I think the following advice, therefore, is very helpful:
Be soft in your practice. Think of the method as a fine silvery stream, not a raging waterfall. Follow the stream. Have faith in its course. It will go its own way, meandering here, trickling there. It will find the grooves, the cracks, the crevices. Just follow it. Never let it out of your sight. It will take you.