[..]Is this time a good entry for buying Polkadot or should I wait for more?
Now? No! Yes, the time when you posted it was a good time to invest in dot. If you had bought this on the day you posted here, then you are already in profit now. if not, then you should wait now as I think the market will come down and that time will be good to buy it. ( This is just my opinion that the market will come down. It's all up to you to, buy now or later NFA)
[...]The main problem with Polkadot is that using its JS wallet is complicated.
Mate, There are many other wallets that you can use to hold your DOT.
Polkadot non-custodial wallets list:
https://wiki.polkadot.network/docs/build-wallets