Given they are away from home and their opponents need a goal, Liverpool will not really expect to have the majority of possession.
When they do have said possession they will need to be careful with it and make sure their passes are not sloppy and do not go astray.
They can also use the fact that Besiktas have to come at them and try to score as the ideal opportunity to showcase what they can do on the counterattack and will want to use the pace Raheem Sterling et al possess as much as they can – that will be the key to their chances of an away goal.