It was narrated that Abu Hurayrah (may Allah be pleased with him) said: The Messenger of Allah (blessings and peace of Allah be upon him) said: “Paradise is surrounded with difficulties and Hell is surrounded with desires.” Agreed upon.
If Paradise is surrounded with difficulties and different kinds of hardships, then how about the highest of its degrees and the most sublime of its statuses?
This indicates that the matter is not something easy.
Source: Islamqa.info
So we know that Jannahtul Firdaws is the highest level of paradise. and it's not easy to get. people who do less efforts can't get it.
but however
It was narrated that 'Umar bin Al-Khattab said:
"The Messenger of Allah (ﷺ) said: 'Whoever performs Wudu' and does it well, then says: "Ashhadu an la ilaha ill-Allah was ashhadu anna Muhammadan 'abduhu wa rasuluh (I bear witness that there is none worthy of worship except Allah, and I bear witness that Muhammad is his slave and Messenger)," eight gates of Paradise will be opened for him, and he may enter through whichever one he wishes.'"
Sunan an-Nasa'i English : Vol. 1, Book 1, Hadith 148
in this hadith it says if you just do wudu and recite "Ashhadu an la ilaha ill-Allah was ashhadu anna Muhammadan 'abduhu wa rasuluh" then you will get all the gets of paradise. so if a person do less deeds or doesn't do other optional good deeds like sunnah prayer etc, and just recite that after wudu will he still get Jannahtul Firdaws? doesn't that makes it easy to get?