A friend made up a small home-made jig to help hold down SMT parts when soldering. It was nothing more than a short bit of wood with a nail through it, bolted to a short post and a stand so that it could swivel up and down. He blunted the nail with a file after nailing it through the cross beam. You sit the board under the jig and lower the nail down to hold the SMT part in place. It's like an extra hand.