Pegging! Need advice please My bf (36M) and I (38F) are expecting our first dildo to arrive tomorrow! He's beyond excited, but I'm more apprehensive. He enjoys anal play, and I don't mind doing it to him. But now we're going full on harness and dildo pegging and I'm quite nervous! 
What should I know to prepare for it? I feel really awkward about taking on this role. Advice or encouragement welcome! 