Yes do not attempt this job without the correct timing pin set and also replace the timingbelt (Cambelt) and tensioner set. This engine is also fitted in the Clio and Nissan Micra so if you are going to have a go at it yourself try a Haynes Manual for assistance or take it to a garage or a mobile mechanic who can be less expensive.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix vans.