Cut 5 varying lengths of 1.0mm wire between about 12 and 25cm. Grip the end of one of the lengths of wire with the round nosed part of your pliers and curl over. Then curl the rest of the wire in a loose spiral. Repeat with the remaining 4 lengths.
Cut about 50cm of 0.4mm wire. Secure each of the 5 1.0mm lengths to the centre of the base. Do this by holding each length, at the non curled end, against the base and wrapping the 50cm length of wire around them both. Arrange the wires so that they spiral in different directions, giving a firework effect.
Cut 100cm of 0.4mm wire. Beginning at one end of the tiara base, wrap the wire tightly and neatly along it as close together as you can. About a quarter of the way along thread a bead of your choice onto the wire and then continue wrapping. Keep picking up beads as and when you want them and carry on until you reach the opposite end of the base. Cut more lengths of 0. 4mm wire as you need them. Repeat this technique on the 5 spirals. Make them as full or sparse as you fancy.
Your finished tiara should look something like this.