well i dont know about anybody else but, YES its absoloutly normal! Everythings going great untill you get pushed to into the bed and take the lamp and a glass out with you on your way down!
Try not to worry about it it happens to the best of us try and have a sense of humour about it and keep trying, it will get less of a problem as time goes on if im anything to go by but it still happens, laugh it off and try again and if its not working for you then stop.
Good luck