What's your choice? Why? explain

I agree with the answer of Mr. Ayoub Tartir. Planning is not difficult if you have necessary details in hand, and use proper tools and techniques. 

Flexible Planning seems to be more realistic and flexibility is required to be continued till finishing point to ensure success of the finishing stage

I think that Planning is a difficult process, if the project > project manager knowledge, experience.

as well as Planning is an easy process, if project < project manager knowledge, experience...

with my regard...

!!!My  choice  is Planning was a difficult process in case of our great democraty we have 

Planning is for me an easy process... however I got to sit back look over the entire project ,find the starting point ... and as soon as I found it everything else falls into place for me.

Whether your a project manger,a professional in design,  or a beginner in the field it self, If you know what and where you are going to start from and with, if you can work with what you have and under certain criteria's , then planning will be an easy job. Unless you can innovate but you cant expand your thoughts and apply them, then it will be a difficult process.

Agree with answer given by Mr Ayoub Tartir.

Agreed with colleagues answers

planning is

the process of making plans for something

decide on and arrange in advance.

design or make a plan of (something to be made or built

so

it's difficult process

It depends on the project manager knowledge, experience, and the project environment. In general, It needs a lot of time, effort, and stakeholder engagement to be an achievable planning.