Will I be able to see the join between the skirting and plasterboard?

No. If correctly installed the skirting board and plasterboard join will be invisible. If during the installation the plasterboard is not allowed sufficient drying time for the jointing compound, it can crack in the future. It is important that the manufacturers instructions are followed to ensure the joint is dry fully between coats. Drying times are approximately 24 hours in normal conditions or 48 hours in cool conditions between each coat. See USG Boral instructions here