Beginner efforts at DIY

I did get tradesmen in to do some work on my part eat while I was away but a small job in a wardrobe   I decided to tackle myself.
All the ingredients for this were purchased and I sailed away following the instructions given.   But I have rapidly lost confidence.

If it doesn't all go well I will call back my friendly tradie...:)   Tomorrow I need to plaster and smooth before painting.   Should be able to manage that -  everybody says I'm "just like your father" and he was an expert DIYer so I should be able to make him proud?

Wish me luck!