Hi Dan, I'm sorry to hear of your loss,
Don't be afraid to grieve....your soul is important too, we have to, but my advice would be try and remember all them good times you had, all the fun and laughter, cry tears of hapiness and be happy in the fact hes still around just looking after you in a different way now

I agree with what has been said here but also must add your Dad may not come to you straight away, he has also things to do as a new spirit into the otherside, e.g. look at his life, I'm sure you are aware, be paitient. The easiest way is through your dreams...place your intent with emotion to meet, you want to see him again, know hes ok. You will know when you made contact, your dream will see very real and vivid compared to a normal dream, there will just be that thing about it, a feeling that you know it was real. Also be paitient, he may have come to you but you may not be able to remember, we do not remember our dreams every night...
I met my grandad like this once, i really wanted to meet with him again, he came in a dream, i didn't relise, i was also out of body but didn't relise, he played in with my dream and all though i didn't speak to him like he had past I woke up very very happy, i knew it was him and knew he was there.
Another method from Bruce Moen himself is the imagination method. When you go to sleep or during the day, lay down, relax, feel relaxed, clear your mind, kind of drift off but stay awake and imagine, imagine you are outside on your patio? or something similar, sit down, ask him to come, see him walking and sitting next to you, start a conversation (dont worry if you can't actually see), have a conversation, tell him you miss him or whatever you want too, hear his replies, you may feel you are making this up but dont worry, keep playing, get emerged in the scene, let it take over. Sometimes something will happen you didn't even plan! He might say something unexpected and you are shocked because you didnt think about him saying this beforehand! Dont aim for this just get in the scene, sometimes this wont happen but when you stop and sit up you will remember little things which will make you aware he has been to see you.
All this is hard to believe at first which it shouldn't but is, keep trying and something will happen, it takes time but know you are in good hands here and there...
All the best,
Ryan