We have no way of knowing for sure. That's the long and short of it really. There might be examples of some rituals in saga sources that might appear relevant at first glance, but the sagas are extremely problematic to take as an actual source for pre-Christian practices. After all they werent compiled until centuries after conversion to Christianity by a Christian for consumption by a Christian audience within the confined of Icelandic society. Not to mention how often the sagas are inconsistent with some of the archaeological evidence that has been uncovered concerning Norse religious practices.

Furthermore there is no reason to assume that would have been any sort of consistency, either temporal or locational, over the time frame you mention. The 9th and 10th centuries involved some pretty important changes to Scandinavia, not least the introduction of Christianity. But what a "Dane" might have done in 867 might have been very different from a raider coming from what is today Norway in 950, which in turn would be different from what someone from Iceland would do.